How to detect if a plugin is "installed but disabled" or "not installed" on firefox browser?

I’m still running Firefox 2. For me, I go to the “Tools” menu and then click on “Add-ons.” Then a list of all my add-ons pops up and from there I can see which are running, and I can disable/enable/uninstall them.

Yes i know how its done from the UI. What i meant was if its possible to detect that from the server side. Say i have disabled a plugin and i forget about it. Now i enter a site that needs that plugin to run some code/flash/feature. So it’ll tell me to install that plugin. I’ll keep installing but it wont work because i have disabled it. Is it possible to tell user that plugin is disabled and so please enable it instead of making him re-install?

Thanks

Ohhh. Well, damn. I don’t have an answer, then. Sorry!

“about:plugins” type it in your URL bar