I _have_ the same issue since I upgraded Abrowser to version 12 (this is an upstream add-on compatibility-related problem). You most probably have installed an add-on (in my case it is TorButton, which is yet unmaintained) which causes this issue (also for me the window reordering and bookmarking with the drag-and-drop feature does not work). Try disabling all your extensions, then restart Abrowser and check if the problem persist. If not, try enabling some extensions and restart Abrowser again until you hunt down the extension(s) causing the trouble.

P.S.: I experienced other issues with the latest Abrowser/Firefox release like regular browser crashes during inactivity or system unresponsiveness by CPU overload. I never experienced so buggy Firefox release from the time I started using it (it was during the first stable v1.0 release, back in 2004 when it was proprietary). Hope the next version would be better.

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