I'm using a conference application called Zoom. There are URLs that can be clicked to open the application and let jump in right away to the meeting that ID existed in the URL. For example: https://zoom.us/j/1234567890

But none of the URLs I tried actually opens the application.

Or for instance when I try to login to my account, the app opens Firefox which after logging in through the web, redirects me to zoommtg://zoom.us/google?code=XXX and Firefox shows a message saying "The address wasn’t understood".

I tried the following boolean key on the about:config page for Firefox.


and I tried assigning true instead of false, but this didn't do the trick.

My Firefox has the following key/value


I understand that this configuration makes me not need to set the previous one as it overrides it.

From within my ~/.local/share/applications

$ cat Zoom.desktop 
[Desktop Entry]
Comment=Zoom Video Conference
Exec=/usr/bin/zoom %U
$ cat mimeapps.list 

[Default Applications]

How can I configure Firefox to redirect the Zoom URLs to the application, so I can login to my account and use meeting links to join the meetings instantly ?


I struggled with this as the instructions on adding a new protocol either referred to pre-Quantum versions of Firefox or assume I have gnome. Finally what worked for me were the instructions I found here: https://www.reddit.com/r/firefox/comments/6p6470/firefox_doesnt_recognize_telegramdesktops_tg_link/

  1. Type about:config in the location bar to get to Firefox configuration. Right click -> New -> Boolean -> "network.protocol-handler.expose.zoommtg" -> false
  2. (Likely superfluous, but I did this while looking for the solution so I'm including it.) Still in about:config, Right click -> New -> Boolean -> "network.protocol-handler.external.zoommtg" -> true
  3. Copy the zoommtg://zoom.us/... link Firefox couldn't open. Then type the following in the location bar: data:text/html,<a href="[PASTE ZOOMMTG LINK HERE]">Click me</a>
  4. An empty webpage should show up with a link that says "Click me" in the top left corner. Click it :D
  5. Firefox should pop up a dialog asking you for the application to open the protocol. Provide the path to the zoom application (if you don't know where it is, type which zoom in a terminal).

Hope it works. Good luck!

  • Confirming this still works with Firefox 80 on Ubuntu Linux. – Skylar Ittner Oct 2 '20 at 0:46

Change your default web browser to Internet Explorer (or another one) to see if it works to isolate if its an issue with Windows or the browser. If its an issue in Windows, in Win10 Settings, System, Default apps, Choose default apps by protocol (or '...by file type). I use Zoom with Firefox v61.0.2 & Win10, here is some pics to maybe help. All else fails reinstall Zoom and/or Firefox. enter image description here enter image description here enter image description here


Mine stopped working when I upgraded zoom. My fix was to go to about:preferences and change the action from "Use Zoom" to "Use other..." and selected /usr/bin/zoom.

firefox applications action

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