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My Firefox suddenly lost the ability to size down when I open the browser, even when I click the button on the upper right corner, it still remain at full screen mode.

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My Firefox suddenly lost the ability to size down when I open the browser, even when I click the button on the upper right corner, it still remain at full screen mode.

This happened

Every time Firefox opened

== I rejected a series of univited pop-ups

My Firefox suddenly lost the ability to size down when I open the browser, even when I click the button on the upper right corner, it still remain at full screen mode. == This happened == Every time Firefox opened == I rejected a series of univited pop-ups

All Replies (1)

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It sounds like you are getting pop-ups right when you start Firefox. Try setting your homepage to the default. See How to set the home page. If you didn't set it to where it is now, it's possible that you have malware on your system. See Troubleshoot Firefox issues caused by malware