On blocking stuff: AdBlock is your friend (and it's available for Mozilla, too).
Internally, Firefox is cleaner, which makes it easier to develop extensions for. I also find that it crashes/hangs less without the Mail/News component getting in the way.
The memory footprint is smaller, but that's largely negated if you run both Firefox and Thunderbird (as I do). However, a lot of people use Firefox and Outlook (since the latter is required at a lot of businesses), and this makes it easier.
Of course, if Mozilla floats your boat, why change?
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Internally, Firefox is cleaner, which makes it easier to develop extensions for. I also find that it crashes/hangs less without the Mail/News component getting in the way.
The memory footprint is smaller, but that's largely negated if you run both Firefox and Thunderbird (as I do). However, a lot of people use Firefox and Outlook (since the latter is required at a lot of businesses), and this makes it easier.
Of course, if Mozilla floats your boat, why change?