Chrome dev tools are equal as powerful, and regarding the other comment about speed. I have tried the new firefox and chrome still flows better. The reasons posted here are not sufficient, sounds like the firefox users are just loyal.
No, it has nothing to do with loyalty but with utility and how you weigh the different feature sets of each browser (speed et al. being features as well for the sake of this discussion). I find such claims disingenuous because they assume that Chrome can act as a drop-in replacement for Firefox which can be trivially shown not to be true. You seem to compare the browsers from the point of shared features or features exclusive to Chrome which understandably can lead to wrong conclusions about Firefox users.
Chrome's features don't constitute a superset of Firefox features and vice versa. Examples for features exclusive to Firefox:
1) Tab groups
2) Awesomebar (which works very differently than the Omnibar)
3) History sync
4) Load tabs on demand
5) Bookmark tags
6) Livemarks
7) Better resource usage (especially memory)
And I could easily add several more, both native as well as the ones added by extensions. You may not care about some or all of these features because they don't fit into your browser usage pattern, but others do. Speed is also important to me and I'm glad that Firefox gets improved with each new version currently but it's not the deciding criteria as long as it doesn't inhibit me from using the browser as I wish.
I recently started using Firefox Aurora after years with Chrome, so I'm not a loyal FF user :)
What made me switch is vimperator, I really like being able to navigate with the keyboard when my MBP is docked and issuing commands by their name(e.g., I can add a page to pinboard with `:pin`), also it saves some screen space by removing the navigation toolbar.
Another nice feature is macro-recording, if you are doing a very repetitive task you can record a macro and run it when needed.
Obviously FF is far from the perfect browser, I hate that it doesn't use native ui elements on web pages(e.g., the `select` html element) and I think it's a bit more resource-hungry than Chrome.
"I think it's a bit more resource-hungry than Chrome"
Depends on what you measure and your usage patterns. Firefox runs circles around Chrome with regards to memory usage and features like "load tabs on demand" can further lower the general resource usage drastically.
The lack of native UI styling of 'select' elements is a disgrace though, especially on Mac. Firefox is the last browser to exhibit this and there are no sign that this will changed in the near future. :-(
