After installing yesterday's updates (Friday 19th October 2018), I see screen tearing when dragging tabs in Firefox.
Maybe this is due to libxrender or xorg-server ?
Update operation here: https://pastebin.com/KD4HMN28
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Description
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Yes, it's still happening in Firefox 70. I think it's due to a custom Solus Firefox configuration.
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I don't think so. The only relevant config I can think of is this line: https://dev.getsol.us/source/firefox/browse/master/files/prefs.js$22
Out of curiosity, are you running MATE as your nickname suggests?
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I no longer see tearing when dragging Firefox tabs !
Maybe the mesalib update from 19.2.6 to 19.3.1 fixed this. Thanks !