Photoshop Web (Beta) only supports Chromium-based browsers, Descript only supports Chromium-based browsers (well, Firefox still seems to work but you’re on your own), and many new webapps are only supporting Chromium-based browsers. Now, these are beta products, so that might change, but it seems unlikely. So I’ve been switching to Chromium-based browsers to use some of these apps, but I’d really rather not. It’s the way everything is going, unfortunately.
A lot of developers target the web because it means they can have one codebase that is supported on multiple operating systems. Imagine how much harder it would be to develop a macOS, ChromeOS and GNU/Linux version in concert with the Windows version. In reality, some browser engines support more web features than others, and Google has by far the most resources to keep up with those standards. So Firefox is an afterthought. Google Chrome is on every operating system worth supporting anyway, so why bother supporting another browser? It’s a lot less work and testing.
MDN is the best place to read about those standards, though.
I much prefer the developer tools. Everything is a lot easier. I always use Firefox when doing web development.
I can easily customize the browser. For me, this means having a separate dedicated URL bar and search engine bar.
The search engine bar lets me swap between search engines very quickly and keep my previous search terms for new tabs. Switching search engines is really annoying in Chromium-based browsers because you need to use shortcuts, and there’s no autocomplete for shortcuts. It also doesn’t tell you whether you typed the shortcut correctly, so you’re guessing every time! It’s really under-developed. The Android Chromium-based browsers are even worse. You can’t change search engines at all when searching; you need to change your default engine. Firefox lets you search any search engine easily on iOS, and slightly less easily on Android.
I can…turn off history? Apparently this is an amazingly complex feature that Chromium-based browsers just can’t handle. The best you can do is clear it when exiting, but you can’t just turn history off.
Okay, it’s mostly the search engine thing, to be honest.
But Firefox still doesn’t use the new GNOME thumbnail view when you’re uploading files, for example…