Experimentally, I removed google from the list of possible search engines in the search bar on firefox. Now I can't find it again--apparently so few people need to actually add google that it's pretty much impossible... How do I get google back in the search bar?
Had the same problem, Google disappeared entirely with no way to restore it. The "Manage search engines did not work.
Citing the wonderful answer of Anurag from post How to restore the default Google search engine in Chrome?
Settings > Search Engine > Manage search engines > Add (button)
**Name:** Google **Keyword:** google.com
And paste below code in the URL box:
Hope this works for you as well as it did for me!