[Discuss] newbie seeks advice for extension

[Anirban Banerjee]

Hello everyone,
                      I am absolutely new to developing extensions for
mozilla. I need a little advice about whether extensions are the
solution I should choose. Thanks in advance for any replies :-).

The goal: A piece of software to be distributed freely which would log
the URL typed in the address bar and then check a server to see if
that URL is good/bad..etc.. and then show a green bar/button/something
to indicate everything is OK or show a red popup saying be careful..

I want to develop something similar to mcafee siteadvisor's plug in. I
have glossed over one code sample (the proverbial hello world plug
in) .

Question:
1) Is a plug in capable of this requirement?
2) Is a plug in loaded and started as soon as the browser is opened?
3) can a plug-in work like a "standard" stand-alone program, creating
files (to log urls), matching etc.. making a warning box pop up?
4) Can anyone please let me have a pointer to a project which you
think is similar to the requirements I have specified.

(I did browse through the active projects list but was not sure which one to
look up!)

Thanks again,
-A
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