Because brain.

It’s not Chrome or a Chromium-based browser.

Have you ever used it's DevTools? Chrome DevTools feels outdated in comparison

Because I used the old mozilla browser back in the 90s and when it switched to calling firefox I kept on using it.

I'm not sure if using Librewolf on desktop or Mull on mobile counts but they are pretty good hardened forks of Firefox.

Firefox is great but the downside is that it isn't as private as browsers I've mentioned by default. Still, it is solid choice from privacy perspective.

Extension support/customization.

I used Firefox on the desktop since it was called Firebird. I could mix and match and mush all sorts of crazy things into it over the years. I was very happy with it.

Then Australis (sp?) changed everything on the desktop and broke all my extensions. Some still worked, but since the goal was "be Chrome" I just switched to that.

On mobile it was a similar experience. I could add all sorts of extensions and then one day I just couldn't. All the browsers were basically the same so I switched to Chrome.

One day Chrome added the ability to have the URL bar on the bottom and I was so pleased. Then one day they took it away. I looked online how to get it back and discovered Firefox could do it. Then I learned that as long as I used Firefox Nightly I could install extensions. (I think you can do this in stable now?) Then I learned about a handful of other useful customizations.

I use Firefox mainly. I use Chrome sometimes if I'm testing something, mostly to test "Did I fuck up with my constant customization in Firefox or is this website just stupid?"

I use Firefox because it (generally) let's me decide how it should work.

My FFFL Tatoo is gonna be so rad.

I use Firefox because I really like the containers extension that makes sure each tab is its own environment to prevent cross contamination of cookies etc. Also, I can rest assured that ublock origin is working as intended by the author since it is primarily targeted toward Firefox these days I think.

Sadly I had to stop using Firefox on my gaming Windows box because for whatever reason my Firefox install seems to gobble up all of my GPU memory. It's working fine on Mac and Linux though.

Privacy primarily and less likely to be targeted for widespread attack because there's a fraction of the user base Chrome enjoys.

Because Pale Moon became a dumpster fire.

Was originally an Opera user (before they switched away from Presto), then switched to Firefox afterwards.

Firefox was my pick because it was good enough and extremely customizable.

Because the only thing it doesn't have that I miss from edge is the vertical tabs, otherwise its just better in every way that matter to me.

And before someone mentions it, I am aware there are vertical tab options, but none of them are the close enough.

Years ago it was the only customizable browser, that's why I started using it. Today it still is the most customizable one, even though other browsers started supporting add-ons and themes too.

Honestly I'm just used to it. Using it now for probably about two decades.

I was a big Netscape fan and when Firefox came out, I adopted it pretty soon. Never left it as I never quite get the hang of Chrome.

Because it appeals to furries.

Honestly, even though I want to say it's for security or something, I use Firefox because of habit. Ive used it ever since I got my first PC over a decade ago and don't remember the reason I switched in the first place.

Like the logo and it works as well as the alternatives

Originally (more than a decennia ago) because it had better customizability, later because it was less memory hungry.

I used to for many years and recently moved to Arc. It’s a totally different experience of browsing the internet and workspace management, however I’d like to go back to Firefox if it’s possible to tweak it as much as possible to Arc.

It's a great web browser and it represents the very concepts of choice and freedom. Chrome isn't better at all, I really only used it because the extension availability felt higher for a while.