115. That's on old option. What OS are you using

Do you mean 150

Looks like you use the Firefox version from your Linux distribution and your Linux OS has reached EOL and is no longer supported.

Support for 32-bit Linux has stopped with Firefox 145, so if you are on 32-bit then you can either use Firefox 144 or use the Firefox 140 ESR version and still receive security updates.

• https://support.mozilla.org/en-US/kb/firefox-has-ended-support-32-bit-linux

You can download and install the current release if your computer supports this.

• https://www.mozilla.org/firefox/all/desktop-release/
• https://www.mozilla.org/firefox/150.0.2/releasenotes/

All Firefox releases on the Mozilla server:

• https://download-installer.cdn.mozilla.net/pub/firefox/releases/

Yes Firefox 113,0 was the last version to get package update on some old versions of Ubuntu and Mint as software package updates was made EOL as said.

Either you have to update to a currently supported version of your Linux distro to get package updates or use the Firefox Linux tarballs from Mozilla. Note you need to make sure where you put the Firefox folder that it has read/write permissions to get internal Firefox updates from Mozilla much like on macOS and Windows.

115. That's on old option. What OS are you using Do you mean 150

The older Firefox 115 ESR is still being updated with security/stability fixes for Windows 7, 8, 8.1 and macOS 10.12, 10.13, 10.4 in mind since Firefox 116.0 requires Windows 10, 11 and macOS 10.15+.

However 64-bit Linux can run the current Firefox 150 Release and Firefox 140 ESR.