When Firefox was forked from Mozilla, it was revolutionary.
It was promised to be non-bloated, incredibly fast, and have both theming and extensions which loaded easily (the alternative either had none, or required rebooting for every theme change, etc). That was what people like me were eager to donate to.
Then over time, it felt like management changed. I was genuinely interested in Firefox Mobile, but that seemed like there was simply insufficient developers for that project.
And instead of fixing issues, CEO pays increased drastically, but the major issues continued. When your computer has intermittent connectivity, Firefox SERIOUSLY struggles. Every other browser works perfectly.
I noticed this started happening when they applied the patch a few years back to stop people continously reloading sites which weren't loading (DDOS'ing them further). No idea if that patch was the cause (I never properly checked), but I only noticed it after that.
Also, a CEO with common sense wouldn't come begging for money when they could throw a bit of their pay in to help out the company too (who knows what their bonuses are like). It's just left a bad taste in many people's mouth