Have you tried asking your distro support? Removing GC should be a simple matter of using the package manager. It would not normally be necessary to remove GC before installing Firefox. How are you trying to install Firefox?

https://support.mozilla.org/en-US/kb/install-firefox-linux

What distro do you have, and is it still supported or has it reached EOL ?

Verify that you meet the System Requirements (GTK+ and GLib) for the current Firefox release.

• https://www.mozilla.org/en-US/firefox/system-requirements/
• https://www.mozilla.org/en-US/firefox/121.0.1/system-requirements/

You can find the full installer of the current Firefox release (121.0.1) in all languages and all operating systems here:

• https://www.mozilla.org/en-US/firefox/all/#product-desktop-release
• https://www.mozilla.org/en-US/firefox/121.0.1/releasenotes/

my chrome version of chrome is expired and no longer supported - this apparently complicates the matter - I've tried a couple of different programs and 2 looked like they had done the trick but they didn't - I am a senior user - disabled vet and bedridden currently so I don't understand a lot of computer jargone - like GTK+,GLiB, and distro ??? - blame it on Vietnam and the 4th Infantry Division

What kind of device is this since you posted with a ChromeOS user agent ? Is this about a normal desktop device ?

There is no real need to uninstall Google. but if you have a special device running ChromeOS, then you may need other instructions for installing Firefox.