It's not the browser: I'm also using Firefox, and the tab is there.
I notice that your screenshot for Firefox says you're sharing your screen with someone. Perhaps that's why the Feedback tab is missing for you?
I don't currently have the Feedback button on Chrome or Firefox, and I am not sharing my screen.
Do you still have the problem? I have the Feedback links using both Firefox and Chrome, but it's now 12 hours on from your report.
I think the Feedback button is shown to a subset of users. Sometimes I see it, sometimes I don't.
I have it today; I did not have it yesterday. Chrome and Firefox.
@Paul W , I still do not have feedback on Firefox. Thanks
Some browser extensions block feedback buttons. Disabling those for FamilySearch.org might fix it for you.
That I have a feedback button only sometimes disproves the hypothesis that I have a browser extension that blocks them, and supports the hypothesis that the feedback button is displayed selectively.