What's this in my Firefox?


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It's been there ages and I have absolute no idea what it is. All I know is that if I click on it, the page goes sort of dim.

post-33613-1115748640.png

So what is it?

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Doh! The moment I went to list them I spotted it. It's a screen ruler. I vaguely remember installing it.

Thanks for the help.

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