Linux Mint... What version are they on? Try downloading Firefox from Mozilla, run firefox-bin from the folder and see if you have the same issue. https://www.mozilla.org/en-US/firefox/all/#product-desktop-release You can then just use the import option and or sync to get your data into the new browser. I run several versions from my Download folder. see screenshots

Mozilla publishes technical requirements for each major release. If you aren't running a recent version of Linux, you may need to check these manually. For example, the latest Extended Support Release is based on Firefox 128:

https://www.mozilla.org/firefox/128.0/system-requirements/#gnulinux

Is there a way to upgrade firefox on Linux

Unlike with macOS and Windows, there are multiple ways you can install Firefox on Linux.

Depending on your Linux distro one can use ex: .rpm, .deb, Snap, flatpak or perhaps the best long term way in keeping Firefox up to date is with the tar.bz2 tarbals from Mozilla. https://www.mozilla.org/firefox/all/desktop-release/linux64/

With the tar.bz2 version you just untar it and run the Firefox-bin to start Firefox. You just have to make sure the Firefox folder has read/write permissions for the user so you can then get internal Firefox updates from Mozilla. An easy way is to put the Firefox folder in Home.

Older versions of a Linux distro gets dropped in package updates over time so as a result packages like Firefox may no longer get package updates from the distro unless you install a newer version of the distro. The tarbal version does not care about this as Firefox may even run fine on a distro version from a decade a go and long since stopped in package support.