Greasemonkey-like Firefox plugin for automatic browsing

Question

Is there a plug-in for Firefox that would allow user's Javascript code like Greasemonkey and be able to browse from page to page?

I'd like to write a script to:

1. Log in to a website.
2. Follow several links.
3. Make a GET request to that host periodically with given data and time intervals.
4. Make a POST request based on the results of the previous in-loop requests.

Now I use Python's mechanize for a browser so I'm looking for something with similar (maybe not that rich) functionality within Firefox. Do you have experience with that type of things? What should I check out?

Answer 1

You also have iMacros

The software's description on Mozilla Addons says :

Automate Firefox. Record and replay repetitious work. If you love the Firefox web browser, but are tired of repetitive tasks like visiting the same sites every days, filling out forms, and remembering passwords, then iMacros for Firefox is the solution you’ve been dreaming of! Whatever you do with Firefox, iMacros can automate it.