This add-on requires a newer version of Firefox (at least version 61.0)" - Why can't I install this add-on, even tough I am using a current Firefox version (66.0.5 on Linux/Fedora)? :
Firefox Quantum has begun rolling out! : r/firefox
Firefox 60.0 release overview - gHacks Tech News
Entering the Quantum Era—How Firefox got fast again and where it's going to get faster - Mozilla Hacks - the Web developer blog
Entering the Quantum Era—How Firefox got fast again and where it's going to get faster - Mozilla Hacks - the Web developer blog
Mozilla starts testing Firefox 57 rectangular tabs - CNET
Windows 10 Help Forums
How to set up Firefox Quantum's interface for Windows tablets - MSPoweruser
Firefox 32 Supports Public Key Pinning | DigiCert.com
Add Downloads Button to Firefox 57 Quantum
Firefox 89 ships with interface changes - gHacks Tech News
Customize width of pinned tabs in firefox using Tab Mix Plus - Super User
Firefox Quantum: New browser is faster than Chrome on Google webpages, Mozilla claims | The Independent | The Independent
How to Manage the New Tab Page in Firefox 57 Quantum
Pinned Tabs - keep favorite websites open and just a click away | Firefox Help
A Day with Firefox Quantum | DanylkoWeb
Firefox Quantum Developer Edition: the fastest Firefox ever with Photon UI and better tooling - Mozilla Hacks - the Web developer blog
How to Reset/Refresh Chrome and Firefox Quantum Back to Default Settings. (Without Reinstalling)
A Day with Firefox Quantum | DanylkoWeb
Firefox 112 Now Available With Support For Importing Chromium Snap Browser Data - Phoronix
Latest Firefox Version Supports Public Key Pinning - Hashed Out by The SSL Store™
Firefox 67 Released With Cryptominer Blocking, Performance Boost
Windows browsers: New Opera 51 'far faster than Firefox Quantum 58' | ZDNET