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If you value privacy, ditch Chrome and switch to Firefox now
(www.fastcompany.com)
This is a most excellent place for technology news and articles.
It works fine with my Cinnamon window manager. So the bug could be in Firefox, in your WM, in both, or more likely in the integration of two, as a side effect, which why I've said "on the edge". It's nearly impossible to test your software with every combination of a system. So the solution here to file an issue both for WM and Firefox and hope someone from either communities will solve it. Or just get another browser or WM.