– Legacy addons are not vetted via Mozilla’s modern review process.
It was the final version to support legacy plugins like Silverlight and Java (excluding Adobe Flash), which were being phased out in favor of HTML5. The Quantum Leap: firefox version 52.9. 0 esr download
If possible, move to a lightweight Linux distribution (e.g., Linux Mint Xfce, Puppy Linux) and run the latest Firefox ESR (115+). This is vastly more secure. – Legacy addons are not vetted via Mozilla’s