Firefox is a web browser from Mozilla, available on desktop and mobile devices. It is presented as a lightweight, privacy conscious browser with browser sync, ad tracking, a built-in PDF editor, and private browsing.
Firefox is ideal for users who are tech-proficient and eager to customize their browsing experience to meet exactly their needs. It is best for people who are very contemplative and thoughtful about their experience of using web browsers and want more than an out-of-the-box or clunky experience offered by pre-loaded browsers.
It's a light and customizable browser, but it sometimes lacks stability. It happened to me that I lost a few hours of work due to random crashes on a 2018 MacBook.
It can do anything I throw at it. It does not slow down. I cannot remember it ever crashing. Updating is super easy. It's colorful enough to find what I need visually. I can customize the look to make it super usable and fast with muscle memory precision. It's by far easier to use than any other browser.
Vivaldi Browser is great in terms of usability and customization, if you don't like something the way it is by default, there's a good chance that you can tweak to make it work for you
Mozilla Firefox stacks up very well alongside similar products. There has not been a feature I have needed that a similar product had that was lacking from Mozilla Firefox. The product has been developed very well and updates have been effective at maintaining security. I have been a long-time user of Mozilla Firefox and have no reason to change.