Allow certain add-ons/themes to not sync across browers.

[WoodwardIII]

Add a box you can uncheck on the 'Manage extension' page next to each addon/theme to disable them from syncing with other browsers on your account.

This would be useful in at least two places:

• Setting different themes in nightly so is visually obvious which Firefox is open (I daliy normal FF but use nightly for testing code)
• Only have performance add-ons were needed (eg h264ify on my old pc but not my new laptop)

Seriously Firefox devs, PLEASE add this, the lack of it is a problem for me every day, and when I switch computers I need to manually toggle about 5 things off and on just to do work (and by work I mean the all-important pastime of video watch).

[Jon]

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