I am also experiencing this problem on Thunderbird 102.9.0. I do not experience this problem with Firefox, only Thunderbird, hence noting it on this ticket, not the dup.
If I run Thunderbird from the commandline (with or without MOZ_ENABLE_WAYLAND=1, per that other bug linked above), the menus function as normal, whereas launching with Synapse (0.2.99.4) results in the problem described here immediately on startup.
I am also experiencing this problem on Thunderbird 102.9.0. I do not experience this problem with Firefox, only Thunderbird, hence noting it on this ticket, not the dup.
If I run Thunderbird from the commandline (with or without MOZ_ENABLE_ WAYLAND= 1, per that other bug linked above), the menus function as normal, whereas launching with Synapse (0.2.99.4) results in the problem described here immediately on startup.
I am on Ubuntu 22.04.2 LTS.