Plan to make a SO indicator for Firefox

Question

Problem: to show that a Not-SO-page has been discussed in SO when you at the Not-SO-site by a SO indicator at Firefox bottom bar

How should the extension work?

It should show a colorful SO indicator if the not-SO-page has been at SO.

I assume that we cannot use

• Google (because the addon is apparently against its TOS)
• SO has no similar search as the following Google search

The Google search which we are not allowed to use

site:url_in_firefox

Is there any to see whether the Not-SO-page has been discussed elsewhere or not?

Answer 1

Check out these tutorials at David Walsh's blog:

• Firefox Extension Template
• Package Your Firefox Extension into an XPI
• Adding the XPI MIME Type for Firefox Extension Installs – if you want to make users able to install your add-on from your server and not the official add-on repository