Qué tal?
Is there a keyboard shortcut for switching between tabs in Firefox 2?
(I mean something like alt+tab used to switch between windows in Windows)
It's Ctrl + TAB to switch tabs in Firefox
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here you go:
click Ctrl+Page Up to move to the previous tab, or Ctrl + Page Down the the next. You can also try Ctrl + # (a number, on the upper numbers line) to a select a specific tab.
I also recommend using "Tab Catalog" add on - really makes life easier.
helinus' answer is correct, I don't understand why someone gave this answer a thumb down. What I like about ctrl-tab is that it works in other apps as well, for example if you have a few open documents in Word you can switch between them with ctrl-tab.
Raanan's answer is also good. I recommend the Tab Mix Plus extension, while we're at it.
The keyboard shortcut is "Ctrl + Tab" to switch between tabs.
ctrl + pgup or pgdn