Works fantastic, but I am BEGGING you, if the developer is reading this, PLEEEAAAASE give it a separate toolbar button to open directly, I'm not able to use it alongside other sidebar-related apps without switching back to it physically in the toolbar menu, which I severely dislike doing

Wrk better as a tab which gives you fullscreen, BUT, I really wish it had dark mode.

Works well on except for when you try to type a letter like ä á â or ê on a keyboard that doesnt have it. Instead it inserts both letters, which feels clumsy. I'm using this on mac, this may be specific to this platform but it may be wise to check.

Tried it briefly. It works, so five stars on that I suppose. But loading the desktop version of messenger isn't great, couldn't you offer the mobile version (m.facebook.com/messages)? I use facebook messaging in Firefox on my phone (with uBlock origin blocking all those attempts to make me install the app) and it's perfectly serviceable.