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First off, why would I want to download addons? Why should I need to spend hours of my time going to sites, downloading shady executables, just in order to use a basic browser? Addons do not count in a browser's features.
Shady executables? Everything on the firefox addons website has been tested, and Firefox starts out as good as Opera, the addons make it even better.
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Custom panels and links on those panels is the biggest feature I use. I like to get rid of buttons that don't do anything, like home, and why do you need a stop button AND a refresh button at the same time..? I also like to link to all the sites I use commonly there, simply by dragging and dropping from the URL bar.
Firefox allows you to edit how your bars look...
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Quick search is also a big one. Right click any form, and click create search. Now, just by typing one word (or letter), you can run a search on any site, anywhere. I've got one set up for countless sites that I often use.
Is it really that difficult to type site:x at the end of a google search?
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I don't know why, but in Firefox, tabs always open in the background, and there's no way to create a new tab without first going into the menus.
Ever tried Ctrl-T?
The only reason people like certain browsers more than others is because of what they are used to. If I already have gotten used to Fx, and I have a bunch of add-ons for it, why should I switch to Opera, when it's really not THAT much better, and visa versa. Until one gets amazingly better than the other, it's all down to preference.
None.