A Way To Observe Url In Urlbar Of Firefox, And Get An Event Every Time It Changes

I need it for my firefox extension. I don't care about waiting the page load completely, I want only observe URL and get an event every time it changes, also when I do history back

Solution 1:

https://developer.mozilla.org/en/Code_snippets/Progress_Listeners#Example.3a_Notification_when_the_value_in_Address_Bar_changes

Also How can i check if url of current browser tab is changed?

Solution 2:

SWFAddress has a Javascript library that lets you do just that.