Not Chromium, has custom CSS for the GUI, is open source software and it has a nice extension library

Also it's also a pretty good browser (right now I'm technically not using Firefox, but rather Librewolf, but still based on Firefox)

Principle.

I switched from Netscape Navigator to Firefox and have used it since. Have tried other browsers but they can't compete.

Because chrome eats my PCs resources like I eat shredded cheese out of the bag at 3am

I initially switched because I felt like it had better support for linux and specifically wayland. Then stayed for other features that are mostly mentioned in other comments.

I use firefox because Lemmy told me to.

I am slowly switching back to Firefox since Google are nerfing ad blockers in Chromium. I'm switching to DuckDuckGo since their search results have become almost unusably bad recently. Unfortunately though, there it's no usuable replacements for the rest of the Google ecosystem as far as my use case is concerned. I'd even ditch Android if there were a reasonable alternative.

The tree-style tabs extension

Its good enough now and mobile addons exist, plus fuck chrome

Icecat takes too long to compile

Desktop: Google done fucked up. I didnt use FF cause of one of my extensions but I opted out when they started talking about the DRM for webpages.
Mobile: Its just better with Adblock.

Free Software for free people!

I started out with using it on the mobile, due to the add-ons being suported, but then Google starten messing around with chrome, announcing changes to the plugin api that would neuter Adblockers and now, the DRM for the web thingy, and I thought enough is enough.

Firefox still has its issues and Chrome does feel more polished, but I'm going with the good guys on this one.

It is the only one that can hold my hundreds of tabs. It's also ooensource, but that's a bonus. Recently addblocker is a very good feature too.

To counter a monopoly

Tree style tabs in what made me switch to Firefox.

I like that it's not Chrome, and that it's so modifiable.

Also, Edge was using over 2 GB of RAM on my work computer with only one tab open.

Because I can.

good privacy

Doing my bit to support the open web. Plus, while it's probably just familiarity, I've always felt that Firefox works with me while Chrome works against me.

I like that LibreWolf automatically clears history upon closing.

I used to use it way back when it first came out and I was a huge fan, but about the time Chrome was becoming a mainstream alternative I started to have a lot of difficulty with adblockers not working and webpages that refused to load on anything other than Internet Explorer or Chrome, so I switched.

Heard about some of the shady shit going down recently in the Googlesphere and decided it was time to switch back and I'm happy to report that everything runs smoothly again.

Because it works, because I can use ublock on mobile (and a few other cool extensions), and most importantly, because I feel good about using it.

I have Vivaldi installed in case i need a chromium browser but I rarely ever need it.

Because Chrome kept crashing my GPU driver, and Firefox doesn't.

And I used Chrome in the first place because Firefox let malware onto my Windows XP PC. Chrome updated add-ons automatically at that time, and Firefox didn't (not extensions, we're talking things like Macromedia Flash, Shockwave and Java Applets that are long dead now).

Many reasons, but the main one is being able to self-host the sync server. It's just crazy that the entire browsing history of most people on the internet is stored on Google servers, with no e2e encryption!

1. It's FOSS
2. Manifest v3
3. AdBlocking extensions for my mobile too!!!
4. They created Rust my all time favourite programming language.

I used Edge, because it's genuinely an extremely feature packed browser, but when Google announced the manifest v3, I jumped to Firefox.

Unpopular Lemmy opinion, but I hate it. Firefox always freezes on desktop, especially on YouTube. Firefox on Android feels like it was developed for Android 8.0 and never updated. And the worst part is there's a bug on the desktop version in the print preview window when it comes to printing shipping labels, so I have not been able to use Firefox for my company for over 8 months now.

I've reported the bug every time Firefox updates and the bug persists, but Mozilla doesn't give a shit. It's so frustrating.

It's the best

Works good at browser

I like the old icon, and Google shot itself in the foot with the anti-adblock stuff.

It's the right balance between privacy and usability. Chrome or Edge is a no-go. Librewolf sound nice, but out of the box it's a little too private (refuses to save any state between sessions) making it too inconvenient.

It's the only viable browser engine that isn't chromium-based. And it's open source and very functional.

it's the best mobile browser with bottom address bar

I don't like Chromium, on mobile it has extension support.

Because I need a browser.