Two bugs:
Since a longer time, regardless whether "#enable-tab-audio-muting" flag is enabled or not, the tab audio indicator always functions as mute button. I find this annoying, especially audio-playing pinned tabs are very difficult to select/switch to, unintentionally toggling audio instead.
Since a few developer versions, selecting individual words of the URL in the address war does not work anymore. Despite clicking multiple times, the whole URL remains selected. Strangely, it works for opened tabs after a browser (re)start, but once any new tab is created, it is not possible anymore in any tab.