I set it to use WIN+q, nothing happened. I set it to use WIN+1, but it didn't change the default function (Win7-64b) of minimising/restoring program #1 on Taskbar (which happened to be FF). When I then unchecked the hotkey specification, BUT kept the "Hotkey" checkbox checked, the function of keyboard key "1" was suddenly = ALT-TAB?? (NUM 1 worked as "1").
Also if you close to tray several windows you can't END them separately (no such option in tray, and both ALT-F4 and close-button just trays).
when firefox tray icon is shown in Trayhotkey and (all other tray extensions) it prevents many full screen applications from running, and if they, after you exit them firefox will be maximised from the tray by itself..
TrayHotKey is my TOP choice for minimizing Firefox to tray.
Thanks to a hot key (CTRL + 1 in my case) I can minize to tray Firefox and revive it ...
A much better solution for me than "minimize to tray revive" or whatever "minimize to tray" version or solution I tried so far ans stil working with new Firefox version 50 and above (for those who don't know, google "e10s firefox addons"
Working fine with Firefox 50.0.2 (10 dec. 2016). And people looking for a solution to the changes introduced by Firefox 50 should really try this addon.
Open the firefox, then press `CTRL + ARROR_RIGHT`.
If the above operation is invalid, you can open the firefox profile directory(see http://kb.mozillazine.org/Profile_folder_-_Firefox), make sure your firefox is closed, then edit the `pref.js` file, find `extensions.TrayHotKey.opacity_int`, and change its value to 255 (see http://kb.mozillazine.org/User.js_file), then save and reopen firefox.