[Solved] Updated this morning to 6.0 (?) Have since lost the "x" to close my tabs. Can reinstate them in About:config but only while config is open.
Lol! As I said, I now have to right click and close tab for each individual tab. Cannot get the close tab "x" to re-appear permanently. And it has only been since this morning. About:Config close tab value seems to reinstate them but only for as long as Abou:Config is open.
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And in the past 5 seconds have now realised that it was probably an add-on which is slightly incompatible with 6.0! Tab browser preferences was the culprit! ;p