The picture you posted is for a university bookstore, and part of it is blocked. Did you do the blocking?

Make sure you are not blocking content.

https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop also see https://blog.mozilla.org/security/2021/03/23/introducing-smartblock/

https://support.mozilla.org/en-US/kb/smartblock-enhanced-tracking-protection

Diagnose Firefox issues using Troubleshoot(Safe) Mode {web link}

A small dialog should appear. Click Start In Troubleshoot(Safe) Mode (not Refresh). Is the problem still there?

Many site issues can be caused by corrupt cookies or cache.

Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.

• Delete cookies to remove the information websites have stored on your computer {web link}

• How to clear the Firefox cache {web link}

Apparently, I attached the wrong screenshot. If you could return to the initial question and pretend like I didn't send a screenshot, the problem is the following:

I would like to use Google Meet on Firefox for a professional purpose. In Chrome , I can select a specific tab to screenshare; however, I prefer to use Firefox as my default Browser. The problem is, when I use Meet on Firefox, the presentation options don't include sharing a tab. Is there a way to fix this, or do I just need to use Chrome when meeting?

Use Chrome, not a browser issue.

Perfunctory reply. I have all my bookmarks on Firefox. I guess maybe I should just start using Chrome for everything if the issues can't be resolved on Firefox.

There is no browser issue, which is I provided screenshot to show that Google Meet does not have all the functions available in Firefox by design.