I get what you're saying: I'm the same for most products, though I do go out of my way to find and use things that are exceptional and in some cases I've actually kinda succeeded in finding that.
The issue here is that this wasn't always the case, or at least wasn't always this bad. While Firefox has always been far from perfect, there was a time when mozillazine consisted mostly of praise and evangelism, and not all of it naive fandom. Also, as a former Opera user, there was also a time when the landscape as a whole contained a higher quality set of options in general. There were numerous browsers then better than the current least worst.
Even recently, Firefox has inspired hope & interest with Servo, Quantum, and even things like the amazing webextension migration effort: controversial and unpopular with many it was nonetheless a greatly successful engineering effort, and has borne fruit in the recent furore over v3 manifests, with Firefox coming out ahead. It's also got cool added APIs that makes sense for the traditional Firefox community but are still standards compliant and interoperable. But all that progress is now already waning with Servo dev cut, progressive popular distinguishing features like MAC being relegated to APIs & UI removed from core.
There's precious little left to distinguish Firefox from Chrome, and nothing new on the horizon.
