The other day, I was invited to a zoom meeting. Zoom is a video conference application also available for computers. It’s address is https://zoom.us.
When the time of our meeting came, I couldn’t hear anything when connecting from my Firefox browser, and saw the following message:

.
After a short IRC conversation on #freebsd@freenode.org, I installed the User-Agent Switcher and Manager add-on on my Firefox.
This add-on adds an icon to the toolbar, Following is the icon as seen in the dark theme:

Now, when you click the icon, you will see the following popup:

Great! Now you can select a browser and operating system using the drop down lists, and then select the browser’s version using one of the radio button. Then, click the “Apply” button to save your changes and enable the add-on. Click the “Test” button to see what browser details will be passed to the remote server.
Good luck!