updates Meet the browser: Firefox Next

[The_Decryptor Veteran]

Video and plugins are rather buggy so far, on my Mac H.264 videos render as random content (Like previous parts of the page) while WebM works fine, on my PC a H.264 video corrupted the entire content area and I had to restart the whole browser.

[Boo Berry]

I decided to disable e10s until Greasemonkey and LastPass release compatible extensions (LastPass is partially compatible though). Other than that, seems to work fine other than random browser lockups.

[Kyang]

Themes are very easy to change in the Customize menu now, and they still look terrible in Windows with bad alignment, and parts like the window controls not matching their actual, squared-off look (I'm running 8.1 Update 1).  What's going on in this area, if anything?

[rsnn]

Firefox 32.0.1

 

• Start-up crash when using switchable Intel+ATI graphics cards
• Mixed content icon may be incorrectly displayed instead of lock icon for SSL sites
• WebRTC: setRemoteDescription() silently fails if no success callback is specified

[+Neyht Subscriber²]

• Start-up crash when using switchable Intel+ATI graphics cards

really? I hadn't noticed anything on mine.

[+Zlip792 MVC]

I am trailing behind in Inbound update to bug info due to some social work in life. Although I will still post missing ones:
 
CSS Parsing:
@-moz-document regexp('whatever') to Browser chrome code issue - https://bugzilla.mozilla.org/show_bug.cgi?id=1057176

"animation-play-state: paused;" doesn't apply immediately - https://bugzilla.mozilla.org/show_bug.cgi?id=1063992

list-style-type: persian is broken - https://bugzilla.mozilla.org/show_bug.cgi?id=1063856
 
e10s:
https://bugzilla.mozilla.org/show_bug.cgi?id=1045987
https://bugzilla.mozilla.org/show_bug.cgi?id=1063020
[bACKED OUT] https://bugzilla.mozilla.org/show_bug.cgi?id=961867]

https://bugzilla.mozilla.org/show_bug.cgi?id=927424

https://bugzilla.mozilla.org/show_bug.cgi?id=1049564

https://bugzilla.mozilla.org/show_bug.cgi?id=1058977

https://bugzilla.mozilla.org/show_bug.cgi?id=1053454
 
Graphics Layer, Text and ImageLib:
https://bugzilla.mozilla.org/show_bug.cgi?id=1063692

https://bugzilla.mozilla.org/show_bug.cgi?id=1063931

https://bugzilla.mozilla.org/show_bug.cgi?id=1063924

https://bugzilla.mozilla.org/show_bug.cgi?id=1062058
[skia] - https://bugzilla.mozilla.org/show_bug.cgi?id=1061885
https://bugzilla.mozilla.org/show_bug.cgi?id=1059654
https://bugzilla.mozilla.org/show_bug.cgi?id=1057088
https://bugzilla.mozilla.org/show_bug.cgi?id=1063754
https://bugzilla.mozilla.org/show_bug.cgi?id=1063853

https://bugzilla.mozilla.org/show_bug.cgi?id=1062492
 
Clang for Windows build:
https://bugzilla.mozilla.org/show_bug.cgi?id=1034930
 
ES6 JS support:
https://bugzilla.mozilla.org/show_bug.cgi?id=1061853
https://bugzilla.mozilla.org/show_bug.cgi?id=929642
 
JS Engine:

https://bugzilla.mozilla.org/show_bug.cgi?id=1063962

https://bugzilla.mozilla.org/show_bug.cgi?id=1002473

https://bugzilla.mozilla.org/show_bug.cgi?id=1057082
https://bugzilla.mozilla.org/show_bug.cgi?id=1061961

https://bugzilla.mozilla.org/show_bug.cgi?id=1064777
https://bugzilla.mozilla.org/show_bug.cgi?id=1040593
https://bugzilla.mozilla.org/show_bug.cgi?id=1036781
https://bugzilla.mozilla.org/show_bug.cgi?id=1063915
https://bugzilla.mozilla.org/show_bug.cgi?id=1061318
https://bugzilla.mozilla.org/show_bug.cgi?id=1061646
https://bugzilla.mozilla.org/show_bug.cgi?id=1063598

https://bugzilla.mozilla.org/show_bug.cgi?id=1059241

https://bugzilla.mozilla.org/show_bug.cgi?id=1061562

https://bugzilla.mozilla.org/show_bug.cgi?id=1057156

https://bugzilla.mozilla.org/show_bug.cgi?id=1056411
https://bugzilla.mozilla.org/show_bug.cgi?id=1062648 (Fix for Richard regression due to dynamic analysis)
 
Search term highlight: (Landed but seems so backed out but no backout mention in bug)
Screenshot - https://bug1047469.bugzilla.mozilla.org/attachment.cgi?id=8469234
Bugs: https://bugzilla.mozilla.org/show_bug.cgi?id=1047469 ; https://bugzilla.mozilla.org/show_bug.cgi?id=1047472
 
Layout / DOM Performance wins:
https://bugzilla.mozilla.org/show_bug.cgi?id=931668
https://bugzilla.mozilla.org/show_bug.cgi?id=1017425
 
Mozilla sandboxing work:
https://bugzilla.mozilla.org/show_bug.cgi?id=1018966
 
Crash report about:memory should be able to load in about:memory viewer - https://bugzilla.mozilla.org/show_bug.cgi?id=1061960
Status code for non-HTTP XHR (parity IE and Chrome) - https://bugzilla.mozilla.org/show_bug.cgi?id=716491
Support for New Error Page change by 3rd party complete themes - https://bugzilla.mozilla.org/show_bug.cgi?id=1035536
Customization Mode polishing - new tab button move - https://bugzilla.mozilla.org/show_bug.cgi?id=979041
Enhanced Tile support related New Tab Page URL ping removal - https://bugzilla.mozilla.org/show_bug.cgi?id=1062683
DMD enhancement with console print out - https://bugzilla.mozilla.org/show_bug.cgi?id=1063321
[MemShrink] FullScreen on Mac OS X - https://bugzilla.mozilla.org/show_bug.cgi?id=1033679
[TSF] MS-IME 2012 (Win 8.1) sometimes fails to move candidate window to proper position - https://bugzilla.mozilla.org/show_bug.cgi?id=1061810
Port GTK2 to GTK3 - tab widget rendering - https://bugzilla.mozilla.org/show_bug.cgi?id=877605
NavigatorLanguage implementation - https://bugzilla.mozilla.org/show_bug.cgi?id=925849
Don't use PermissionManager to save stuff in nsStrictTransportSecurityService [Public Key Pinning for HTTP] - https://bugzilla.mozilla.org/show_bug.cgi?id=775370
[Oldie] Non localized trademark notice string in about:firefox - https://bugzilla.mozilla.org/show_bug.cgi?id=680392
Initial Cloud Sync support - https://bugzilla.mozilla.org/show_bug.cgi?id=993584
Case sensitivity in Findbar - https://bugzilla.mozilla.org/show_bug.cgi?id=923801
Custom area placement lost when not registered in Customization Mode - https://bugzilla.mozilla.org/show_bug.cgi?id=989338
Remove experiment dom binding preference since WebIDL is now enable throughout code and is future - https://bugzilla.mozilla.org/show_bug.cgi?id=1017424
PaintSVG painting work by passing transforms down, rather than walking up the tree using GetCanvasTM - https://bugzilla.mozilla.org/show_bug.cgi?id=932771
Make sure embedding elements that rely on an embedded SVG's intrinsic dimensions are resized if the SVG is late in loading - https://bugzilla.mozilla.org/show_bug.cgi?id=1063073
Cleanup Window (DOM work) - https://bugzilla.mozilla.org/show_bug.cgi?id=1042654
WebRTC regression in FF32 - https://bugzilla.mozilla.org/show_bug.cgi?id=1063971
[sVG] animate startOffset with negative value - https://bugzilla.mozilla.org/show_bug.cgi?id=1042860
Enable hardware acceleration in AppleVTDecoder - https://bugzilla.mozilla.org/show_bug.cgi?id=1062596 relevant https://bugzilla.mozilla.org/show_bug.cgi?id=1059066

Add a way to specify that nsDefaultURIFixup should obey the domain whitelist when not using keyword searches - https://bugzilla.mozilla.org/show_bug.cgi?id=1057186

Facebook pinning support - https://bugzilla.mozilla.org/show_bug.cgi?id=1004781

[MemShrink] Make a cycle collected version of nsHashPropertyBag and use it from JS - https://bugzilla.mozilla.org/show_bug.cgi?id=931285

[OSX] Recently closed windows not available on hidden window (when all windows are closed) - https://bugzilla.mozilla.org/show_bug.cgi?id=1064217

[MemShrink] Various leaks in dosprintf - https://bugzilla.mozilla.org/show_bug.cgi?id=1019838

Relevant to URL Parser per standard - https://bugzilla.mozilla.org/show_bug.cgi?id=473822

enable sync of privacy.trackingprotection.enabled pref - https://bugzilla.mozilla.org/show_bug.cgi?id=1059548

WebGL - Add more validation to video texImage2D - https://bugzilla.mozilla.org/show_bug.cgi?id=1063805

SVG <switch> elements ignore elements with empty "systemLanguage" attribute when "allowReorder" attribute is set - https://bugzilla.mozilla.org/show_bug.cgi?id=1064063

pdf.js leak - https://bugzilla.mozilla.org/show_bug.cgi?id=963075

[sVG] Make filter references and their update notification mechanisms usable for canvas filters  - Make filter references and their update notification mechanisms usable for canvas filters

[Matrixik]

Any more info what "Cloud Sync" will be exactly?

[+Zlip792 MVC]

Coping up more from Inbound:

 

Startup Crash fix landed in FF 32.0.2:

https://bugzilla.mozilla.org/show_bug.cgi?id=1063052

 

asm.js aka OdinMonkey or SIMD work:

https://bugzilla.mozilla.org/show_bug.cgi?id=1064668

https://bugzilla.mozilla.org/show_bug.cgi?id=1064493

https://bugzilla.mozilla.org/show_bug.cgi?id=1064493

https://bugzilla.mozilla.org/show_bug.cgi?id=948379

https://bugzilla.mozilla.org/show_bug.cgi?id=849567

 

Code Cleanup, Refactoring and Moving:

https://bugzilla.mozilla.org/show_bug.cgi?id=1031092

https://bugzilla.mozilla.org/show_bug.cgi?id=981198

https://bugzilla.mozilla.org/show_bug.cgi?id=1065182

https://bugzilla.mozilla.org/show_bug.cgi?id=1063700

 

CSS Parsing:

Implement CSS parsing and computation of object-fit, object-position - https://bugzilla.mozilla.org/show_bug.cgi?id=1055285

 

JS Engine:

Alias jschar to char16_t for ctypes in add-ons - https://bugzilla.mozilla.org/show_bug.cgi?id=1064935

Improve the "filter types at branches" infrastructure - https://bugzilla.mozilla.org/show_bug.cgi?id=1034184

 

DOM:

Implement the "timing allow check algorithm" for cross-origin Resource Timing - https://bugzilla.mozilla.org/show_bug.cgi?id=936814

 

Cloud Sync:

https://bugzilla.mozilla.org/show_bug.cgi?id=1045046

Enabling in Nightly - https://bugzilla.mozilla.org/show_bug.cgi?id=1052009

 

mozilla::pkix work:

https://bugzilla.mozilla.org/show_bug.cgi?id=1059924

https://bugzilla.mozilla.org/show_bug.cgi?id=1063006

https://bugzilla.mozilla.org/show_bug.cgi?id=1063013

 

DOM searchParams setter doesn't encode correctly - https://bugzilla.mozilla.org/show_bug.cgi?id=1064481

[Regression] Filters are clipped when used in SVG-as-image - https://bugzilla.mozilla.org/show_bug.cgi?id=1062870

Don't run DMD when about:memory's "Measure" button is pressed - https://bugzilla.mozilla.org/show_bug.cgi?id=1061024

Refactor CSS <position>-handling code - https://bugzilla.mozilla.org/show_bug.cgi?id=1060090

Focus on div element after DOM manipulation - https://bugzilla.mozilla.org/show_bug.cgi?id=1061468

Log selections of searchSuggestTable in about:home - https://bugzilla.mozilla.org/show_bug.cgi?id=1036908

Log selections of awesomebar results that "are like" the url in the current search provider - https://bugzilla.mozilla.org/show_bug.cgi?id=1036914

Optimize images in browser/themes/windows directory - https://bugzilla.mozilla.org/show_bug.cgi?id=1062969

Strings for blocking malicious, potentially unwanted, and uncommon downloads - https://bugzilla.mozilla.org/show_bug.cgi?id=1063105

[Regression] Tab-modal onbeforeunload dialog can automatically be dismissed by navigation - https://bugzilla.mozilla.org/show_bug.cgi?id=1046022

Black bars appear briefly when loading zoomed page in new tab - https://bugzilla.mozilla.org/show_bug.cgi?id=1050159

Mozilla TestSuite (Talos) GLTerrain regression fix - https://bugzilla.mozilla.org/show_bug.cgi?id=1061045

Cycle collect nsFormFillController - https://bugzilla.mozilla.org/show_bug.cgi?id=1064587

[MemShrink] Plug leak in TransportLayerDtls::Setup - https://bugzilla.mozilla.org/show_bug.cgi?id=1058331

[LANDED BUT BACKED OUT] Update ANGLE to chromium/2151 + cherry picked fixes - https://bugzilla.mozilla.org/show_bug.cgi?id=1036068

[Regression] Amazon's "Manage Your Content and Devices" fails to render on Nightly (scrollTo float/long issue) - https://bugzilla.mozilla.org/show_bug.cgi?id=1062406

WebIDL (Paris Bindings work) - https://bugzilla.mozilla.org/show_bug.cgi?id=849567

Fix up async scrollbar thumb offset code for multi layer APZ - https://bugzilla.mozilla.org/show_bug.cgi?id=1061327

 

-----------------------------------------------------------------------------------------------------------------------------------------

Yes, Firefox is working on something similar like IE and Chrome to block malicious downloads behind this preference: browser.safebrowsing.downloads.enabled

[The_Decryptor Veteran]

They're also working on tracking protection similar to IE.

There's been a bunch of work related to how Firefox draws and stores images, a lot has landed already and it lays the foundation for "downscale on decode", where instead of storing the whole uncompressed image in memory and then downscaling for display, it'll downscale it while decoding and only store the screen sized representation of it. On a desktop that's not going to help much, but on mobile you go from 1GB of images to 30MB, etc.

Also, the work will allow for icons to scale themselves, i.e. displaying an ICO file at 32x32 will show the 32x32 variant, vs. the 16x16 variant being upscaled. Quite useful for stuff like folder browsing, the download list, preferences window, favicons, etc.

[+Zlip792 MVC]

From Inbound (Resurrecting from old):
 
SVG Work:
https://bugzilla.mozilla.org/show_bug.cgi?id=1062249 ;
https://bugzilla.mozilla.org/show_bug.cgi?id=1065344
 
Nit fix, Refactoring, Removal and Cleanup:
https://bugzilla.mozilla.org/show_bug.cgi?id=1064087

https://bugzilla.mozilla.org/show_bug.cgi?id=1065258
https://bugzilla.mozilla.org/show_bug.cgi?id=1065759

https://bugzilla.mozilla.org/show_bug.cgi?id=1065574

 

CSS/SVG Filters:
https://bugzilla.mozilla.org/show_bug.cgi?id=1058807 ; https://bugzilla.mozilla.org/show_bug.cgi?id=1058783 ; https://bugzilla.mozilla.org/show_bug.cgi?id=1058765 ; https://bugzilla.mozilla.org/show_bug.cgi?id=1058779
 
 
Graphics:
[Performance Improvement] Avoid matrix multiplication in lots of places by using factory constructors and the matrix adjusting methods - https://bugzilla.mozilla.org/show_bug.cgi?id=1065127

Convert all consumers of nsRenderingContext transform related methods to use gfxContext::SetMatrix()/Multiply() - https://bugzilla.mozilla.org/show_bug.cgi?id=1064056

Get rid of nsRenderingContext's PushState and PopState methods - https://bugzilla.mozilla.org/show_bug.cgi?id=1064082
 
ImageLib:
Add RAII smart handles for imgFrame locking - https://bugzilla.mozilla.org/show_bug.cgi?id=1057894

imgLoader::SetHasProxies/SetHasNoProxies should operate on imgRequests/imgCacheEntrys not URIs - https://bugzilla.mozilla.org/show_bug.cgi?id=1063364
 
JS Engine:
https://bugzilla.mozilla.org/show_bug.cgi?id=1034184 ; https://bugzilla.mozilla.org/show_bug.cgi?id=1050649 ; https://bugzilla.mozilla.org/show_bug.cgi?id=1005922 ; https://bugzilla.mozilla.org/show_bug.cgi?id=1047346 ; https://bugzilla.mozilla.org/show_bug.cgi?id=1064251 ; https://bugzilla.mozilla.org/show_bug.cgi?id=966518

https://bugzilla.mozilla.org/show_bug.cgi?id=1034184

https://bugzilla.mozilla.org/show_bug.cgi?id=1065507
[ES6] String(aSymbol) now returns the symbol?s description in ES6 draft rev 27 - https://bugzilla.mozilla.org/show_bug.cgi?id=1058396

SIMD x86-x64: Optimize MSimdValueX4 - https://bugzilla.mozilla.org/show_bug.cgi?id=1051860

 
Garbage Collection:
https://bugzilla.mozilla.org/show_bug.cgi?id=914402
 
Service Worker:
https://bugzilla.mozilla.org/show_bug.cgi?id=982728
https://bugzilla.mozilla.org/show_bug.cgi?id=1042908

 

Sandboxing Work:

Change windows environment variables when running in a low integrity process - https://bugzilla.mozilla.org/show_bug.cgi?id=1018988
 
Moz2D:
https://bugzilla.mozilla.org/show_bug.cgi?id=1065031 ; https://bugzilla.mozilla.org/show_bug.cgi?id=1065558 ; https://bugzilla.mozilla.org/show_bug.cgi?id=1065526 ; https://bugzilla.mozilla.org/show_bug.cgi?id=1065718 ; https://bugzilla.mozilla.org/show_bug.cgi?id=1065737 ; https://bugzilla.mozilla.org/show_bug.cgi?id=1065743 ; https://bugzilla.mozilla.org/show_bug.cgi?id=1065764
 
e10s:
Disable Safe Mode - https://bugzilla.mozilla.org/show_bug.cgi?id=1063848
For Nightly user guidance about breakage + how to disable - https://bugzilla.mozilla.org/show_bug.cgi?id=1063842
[still open due to only landing few stuff fixes] "Tree Style Tab" add-on does not work with e10s - https://bugzilla.mozilla.org/show_bug.cgi?id=1042680
Crash reporting improvement - https://bugzilla.mozilla.org/show_bug.cgi?id=1057663
Session Restore dependent bug - https://bugzilla.mozilla.org/show_bug.cgi?id=1060042
Page Info is broken - https://bugzilla.mozilla.org/show_bug.cgi?id=1058543
Addons / Extension compatibility - https://bugzilla.mozilla.org/show_bug.cgi?id=1062024
 
Gecko Media Plugin:
https://bugzilla.mozilla.org/show_bug.cgi?id=1058903
https://bugzilla.mozilla.org/show_bug.cgi?id=1065049
 
CloudSync:
https://bugzilla.mozilla.org/show_bug.cgi?id=1045046
 
Off the Main thread:
Move some of COMMIT TRANSACTION off the main-thread - https://bugzilla.mozilla.org/show_bug.cgi?id=1047811

 

Networking Cache2:

https://bugzilla.mozilla.org/show_bug.cgi?id=1000338 ; https://bugzilla.mozilla.org/show_bug.cgi?id=1029782 ;
 
[LANDED]  Update ANGLE to chromium/2151 + cherry picked fixes - https://bugzilla.moz....cgi?id=1036068
Cache2 deadlock fix - https://bugzilla.mozilla.org/show_bug.cgi?id=1052266
[Regression since Firefox 11] The CSS rule "-moz-user-select: none" no longer disables text selection when using "Ctrl+a". - https://bugzilla.mozilla.org/show_bug.cgi?id=739396
Unblacklisting driver since it does not stop crash - https://bugzilla.mozilla.org/show_bug.cgi?id=1063048
BMP with compression can be transparent - https://bugzilla.mozilla.org/show_bug.cgi?id=1063084
[LANDED but Backed OUT] Preference Composition/Spelling/Language is ignored - https://bugzilla.mozilla.org/show_bug.cgi?id=967494
Help subview anchor arrow is pointing the wrong way on RTL - https://bugzilla.mozilla.org/show_bug.cgi?id=1003713
addons.repository WARN Unknown type id when parsing addon: 5 - https://bugzilla.mozilla.org/show_bug.cgi?id=1056490
Closing and opening multiple tabs warning dialog dependent bug - https://bugzilla.mozilla.org/show_bug.cgi?id=1063594

GTK3 build cannot display Flash contents - https://bugzilla.mozilla.org/show_bug.cgi?id=1051209

[iMM32] Reimplement mouse button event handling with NOTIFY_IME_OF_MOUSE_BUTTON_EVENT - https://bugzilla.mozilla.org/show_bug.cgi?id=1059643

[TSF] nsTextStore should use StaticRefPtr - https://bugzilla.mozilla.org/show_bug.cgi?id=1062053

[LANDED but Backed OUT] Enable AVX2 in libvpx for VS2012+ - https://bugzilla.mozilla.org/show_bug.cgi?id=1061339

 

-------------------------------------------------------------

 

Firefox for Android Tablet tab redesign - https://bugzilla.mozilla.org/show_bug.cgi?id=1014156

[+Zlip792 MVC]

Minor changes on New Tab Page:

 

- Previously that text hyperlink was inside that gear icon drop down list

 

- Now beside text, pinned icon is also shown on pinned tiles

[Wandering NPC]

When are the ads coming to the New Tab page?

[.stan]

When are the ads coming to the New Tab page?

They are already in, called "Enhanced" mode in the new tab page options.

[The_Decryptor Veteran]

I think that even if you spoof the UA the site doesn't render properly, relies too much on non-standard WebKit stuff.

Same reason Google Images is broken in Firefox on a tablet too, it relies on a WebKit bug to work properly.

Bringing this back, while Google Images eventually got a new UI so the broken-ness went away (They never did actually fix it), they decided to enshrine the WebKit (And apparently IE too) non-standard behaviour in the spec, so now the incorrect behaviour is now correct (Y)

Edit: And annoyingly, it looks like they're now going to support insecure HTTP 2 after all, hopefully just for testing purposes instead of by default, but either way that's pretty lame.

[mancode20]

Is there a way to get fonts looking as nice as they do on IE? I prefer Firefox, but I think the font smoothing or whatever it is might look better on IE11.

[Boo Berry]

Is there a way to get fonts looking as nice as they do on IE? I prefer Firefox, but I think the font smoothing or whatever it is might look better on IE11.

There was the Anti-Aliasing Tuner extension for Firefox to adjust the DirectWrite text rendering, but I don't think it works anymore, not really sure.

[LimeMaster]

Kinda wish they'd focus on fixing the memory leaks, but I doubt they will since they seem to be busy fixing other less serious issues.

[+Frank B. Subscriber²]

Kinda wish they'd focus on fixing the memory leaks, but I doubt they will since they seem to be busy fixing other less serious issues.

Are you sure it's Firefox leaking memory rather than an extension? From my experience Firefox uses the least resources of the current most popular web browsers.

[LimeMaster]

Are you sure it's Firefox leaking memory rather than an extension? From my experience Firefox uses the least resources of the current most popular web browsers.

Well, the newer versions are well known for their memory leaks on Windows. (Maybe Mac & Linux too)

 

As for extensions, I only have three installed:

Adguard AdBlocker 1.0.3.0

Classic Theme Restorer 1.2.3

Old Default Image Style 3.0.5

[+Frank B. Subscriber²]

Try running Firefox without extensions and see how much RAM it uses.

 

Fwiw, the 'Firefox is leaking memory!!!!111' myth hasn't been true for years, no matter how often it is repeated. Want to see a web browser gobbling up large amounts of RAM? Fire up Chrome and surf the web for a day.

 

-- posted using Google Chrome 39 dev

[LimeMaster]

Right so, I temporarily disabled them. Hopefully this time it doesn't end up leaking like it usually does. 

[simplezz]

Right so, I temporarily disabled them. Hopefully this time it doesn't end up leaking like it usually does.

FF doesn't leak memory on my Arch box.

[Max Norris]

Same, I haven't had a real memory leak since the v4 days... very likely a misbehaving extension, Fx itself is quite conservative with memory usage.

[LimeMaster]

Now a few hours past I've notice the memory usage has improved so I guess now I'll need to figure out which extension is causing the leak.

 

Oh well, enough about that! I don't want to completely derail the thread.

[ViperAFK]

Well, the newer versions are well known for their memory leaks on Windows.

...not really. in my experience 99% of fx mem leaks are an issue with an addon or plugin. I haven't had mem leak issues on firefox on any of my machines for years.

 

The versions of firefox known for mem leaks are older versions (1.x-2.x, most mem leaks were plugged when 3.x was released), not modern versions.