Looks like another screen in the background?
Lately when I use Firefox, when I click on a new tab, or it loads a page, there is a blue outline almost like there is another screen behind it.?? It is blue and I can see the Firefox logo in the top left. Sometimes it cover over the top of the tabs.
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Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.
A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?
Can you attach a screenshot?
- https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem
- use a compressed image type like PNG or JPG to save the screenshot