ping

What it does

A firefox addon that pings (over http) a server you configure, and shows an icon for up status, and a different icon for down status.

install

On amo!
https://addons.mozilla.org/firefox/addon/ping/

develop

Clone this repo, open firefox on about:debugging and load the extension by selecting the cloned folder.
Start coding!

make a release

zip the src folder and upload to https://addons.mozilla.org/