User-Agent: Mozilla/5.0 (X11; Linux i686; rv:2.0b13pre) Gecko/20110313 Firefox/4.0b13pre Build Identifier: Mozilla/5.0 (X11; Linux i686; rv:2.0b13pre) Gecko/20110313 Firefox/4.0b13pre [000:003] Browser XEmbed support present: 1 [000:003] Browser toolkit is Gtk2. [000:004] Using Gtk2 toolkit [000:078] Warning(clientchannel.cc:555): Unreadable or no port file. Could not initiate GoogleTalkPlugin connection [000:080] Warning(clientchannel.cc:398): Could not initiate GoogleTalkPlugin connection [000:081] Warning(clientchannel.cc:525): Failed to get GoogleTalkPlugin path. Trying default. [000:086] Started GoogleTalkPlugin, path=/opt/google/talkplugin/GoogleTalkPlugin [000:087] Waiting for GoogleTalkPlugin to start... [001:101] Read port file, port=38750 [001:373] Initiated connection to GoogleTalkPlugin [001:373] Socket connection established [001:373] ScheduleOnlineCheck: Online check in 5000ms [001:473] Got cookie response, socket is authorized [001:473] AUTHORIZED; socket handshake complete [006:384] HandleOnlineCheck: Starting check [006:384] HandleOnlineCheck: OK; current state: 3 [047:246] Error(scriptinterface.cc:288): Passed a non-object for onmessasge_callback Reproducible: Always Steps to Reproduce: 1.open browser from command line open different tabs 2.go to gmail in one of them 3.close gmail tab Actual Results: I get this message [047:246] Error(scriptinterface.cc:288): Passed a non-object for onmessasge_callback Expected Results: no error and view GoogleTalkPlugin in action

same with Mozilla/5.0 (X11; Linux i686; rv:2.2a1pre) Gecko/20110323 Firefox/4.2a1pre

Resolving as wont fix, plugin support deprecated in Firefox 85.