I can't see anybody's video in the meeting about teams-phone-fix HOT 1 CLOSED

Hi @jaumebecks,

Thanks for using the extension and your feedback. :-)
This extension does not modify the behaviour of Microsoft Teams, so it won't solve bugs of Teams.
The concept of the extension is to circumvent the warning message when accessing the Teams web application by simulating a different user agent, e.g. of Google Chrome or Microsoft Edge. This might cause bugs, as Microsoft did not optimize nor test Firefox with the Teams web application.
If you like to have video support of Teams in Firefox, please send a feature request to Microsoft to implement this feature.

In the meantime, i'd recommend to use Chrome or Edge to have a better feature support.
Another alternative is the native Teams application, which is already available for all operating systems (including Linux).

from teams-phone-fix.