If you are concerned about stability of a release with regards to compatibility, why weren't you using the ESR? https://www.mozilla.org/en-US/firefox/organizat

If you are concerned about stability of a release with regards to compatibility, why weren't you using the ESR? https://www.mozilla.org/en-US/firefox/organizations/faq/ https://www.mozilla.org/en-US/firefox/organizations/faq/ Unlike 3.6, it gets security-only updates for a well-defined period of time.