Thanks, i guess i will finally update my firmware as i am still on the 1.2.1 version.
Also mytrezor started to work again in Firefox after i deactivated and reactivated the plugin 2-3 times, no idea why it works now but at least it works

It still says in the log that it failed to load "Chrome Extension transport" but this time it loaded the plugin transport after the failed loading of the "Chrome Extension transport".