I just go it...

Firefox is a panda and not a fox! 😮

My life has changed.

Great. Just FUCKING great. When I was looking at devrant, suddenly some add-ons crashed (correction: ALL add-ons crashed!). All other tabs flooded with ads. I go to the add-ons manager, and what is their SHITTY excuse?
"Starting in Firefox version 57, only extensions built using WebExtensions APIs will work. Not sure if your add-ons are affected? See Firefox add-on technology is modernizing and these Frequently Asked Questions for details."
Anyone of you fuckwits ever heard of LEGACY SUPPORT? Leaving some time so the other devs can adapt to your new brainfart technology?! Even fucking C++ has that. FUCK!
Thank god devrant doesn't have ads.

Dear web developers, please think of the boot disk users.

Users might have to boot their computer from external bootable media such as a live USB stick, SSD, or live CD/DVD, after their operating system caught a problem that prevents it from booting.

Emergency boot media usually has earlier versions of web browsers because they are not frequently used, much less updated. Sadly, the developers of many websites have a habit of breaking compatibility for older web browsers. For example, the new audio player used by the Internet Archive (Archive.org) does not even support Firefox 57, a version that was released as recently as November 2017!

Therefore, websites should retain support for old web browsers. If not all features can be made to work, at least the essential features should work on older browser versions. Websites should not let down people who are stuck due to a computer problem. Those users should still be able to browse the Internet for help, and perhaps enjoy basic entertainment such as watching videos (YouTube, Dailymotion) and listenening to music or audio books (SoundCloud, Internet Archive) while at it.

The attached screenshot shows something no internet user wants to be "greeted" with.

Keep the Internet accessible.