A major reason for me is manifest v3 and other shenanigans designed to neuter ad blockers. Secondary to that is promoting web renderer diversity - as a web dev I don't want to go back to the days where we could only afford to cater to one engine - chromium / blink in this case.

Because I can log into the sync feature without the browser logging me into every single google service automatically with the same account.

Also the Firefox Multi-Account Containers extension.

because Mozilla is not trying to mold the entire internet into an advertising platform.

Lack of alternatives...

Because it's NOT Google and Firefox not embracing WebBundles or the “Web Integrity API” standard from Google. Google want to INTRODUCE DRM on the web.
And just recently YouTube (==Google) now also have very strict medical policy, so it can only follow the WHO guidelines. Google is evil, look out. Even Dr. Eric Berg is getting censored. Look out people.

A couple reasons:

• I really like having my tabs on the side, it just plays well with my vimium workflow
  • This largely narrows it down to Firefox, Vivaldi, Edge, Arc
• I like open source
  • Only Firefox remains

I really like the developer tools. I always the install the developer edition (which is basically just the beta) and I find the defaults and menus more intuitive than Chrome’s, though at this point, they’re probably at feature parity. I could probably get Chrome to work how I want by changing settings but why? It’s not faster or better at this point.

I have ideological reasons too but honestly, the main reason is just that I like Firefox better. As a developer, it’s also nice to have Chromium (or Google Chrome) completely clean. If there’s a bug I can’t recreate in Firefox, I can open Chrome with no extensions or cache. Since that’s sort of the “default” for most users, it’s nice to keep my daily driver separate.

For me, it's not as memory efficient as something like Edge, but it handles having a lot of tabs open much better. It also has a lot of powerful features under the hood, and some really good power user addons, like Tab Groups.

I use it since I know computers and it's better for Adblockimg than Chromium based browsers nowdays.

Originally I started to use it because I'd heard there was a new update to its rendering engine that made it feel faster/better than chrome. After testing it out I did think it felt better at the very least. Now I'm using it mostly for the same reasons and to reduce my dependence on Google/Chrome.

I have been using Firefox since I can remember. That it is open source is a huge plus. The features it offers are great.

Tree style tabs. Can't live without it anymore

Chrome on android becomes unbearable with ads, and full screen vid ads when i just want to read the news. Use ff for the addon.

Many reasons. Many of which is down to how Google as a company is reaching between the proverbial couch cushions to get at the loose change to make a profit. Default opt-in tracking, breaking ad-blockers, and probably more which I forgot about since I abandoned Chrome years ago.

I only use it so that I can watch DRM content (Udemy, HBO, etc)

I've been using Firefox since 2002 when it first became available, at that point it was called Mozilla. It's definitely the browser that I've used the most in about 25 years of browsing the Internet from home. Firefox has a great native Linux version and seems to be widely promoted by most distros. Since switching to Linux seven years ago I also started using Chromium (not to be confused with Chrome) and Opera, both of which also have great native Linux versions.

It came preinstalled.

Not my main but Firefox containers are damn handy.

Because Chromium and its derivatives suck. Is it really too much to ask for a traditional menu bar rather than a stupid hamburger menu?

More open and honest and fight for privacy. Also their devtools are top notch.

It doesn't suck and just works. Really well customizable and adblocking/ security is better than what chrome has turned into. Chrome used to be decent but is garbage now. I'd rather use edge before chrome.

Privacy, real ad-blocking, and fighting for the open web. Also, actually being free software.

Are they the most privacy respecting? no.

are they privacy respecting ENOUGH? sure