Why does the back botton have a extra leg that disappears when mouse is moved over it?
There is a small "leg" on the back arrown that goes away then the mouse pointer is moved over it. Why?
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Do you have any Firefox themes installed which might be modifying the appearance of the back button?
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由 jscher2000 - Support Volunteer 於 修改
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
- https://support.mozilla.org/kb/Safe+Mode
- https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
You can try to disable OMTC and leave hardware acceleration in Firefox enabled.
- about:config page: layers.offmainthreadcomposition.enabled = false
You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.