Firefox has a weird line at the bottom of video playback such as youtube or any of the streaming services
i notice a short line towards the bottom right of just under the bottom border of the video playback in firefox on Mac Os. i went to the apple store thinking it might just have something to do with my mac since i do not see this on windows. The tech took a screenshot of the issue for me and told me to contact mozilla support.
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Start Firefox in Safe Mode {web link}
A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?
Start your Computer in safe mode with network support. Then start Firefox. Try Secure websites. Is the problem still there?
http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode Starting Any Computer In Safe Mode; Free Online Encyclopedia
Actually that was a step that the apple tech took and the line was still there in safemode that picture was actually taken in safe mode