Latest version of Firefox won't allow screen size to be changed
Hello, Version 47.0 of Firefox has just been installed on my PC and I find that it is impossible to change the magification on the screen. It seems to be permanently set on 100% and neither the minus or plus buttons do anything.
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I had this problem also. Start in SafeMode and magnification worked. Fiddled with enabling and disabling.
Problem was NoSquint add-on. I think the magnification went native in 47.0 and NoSquint does the same thing but co-existence did not work. Back to Camp David I guess.
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The NoSquint extension had not been maintained by the author for over three years now. It was luck that it worked as long as it did.
There is also the Zoom Page extension you could try. https://addons.mozilla.org/firefox/addon/zoom-page/