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A white block appears in the top left corner of my screen - how do I get rid of it without restarting Firefox every time?
This seems to happen after I've used Firefox for a long time, or I've had several tabs open. The block covers all windows, whatever application I choose, and can't be dragged. I have to close Firefox and reopen it to remove it.
All Replies (3)
Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
- Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
- Do NOT click the Reset button on the Safe Mode start window
Do a history clean. Most of the problems happen in firefox due to lot of history data. if you upload a image or link to image of the issue it will be usefull to find what is the actual problem.