Firefox Netusage Plugin

It works in Firefox for PC & Apple Mac

To install it;

download the plugin
then find the downloaded file (netusagebtn-ispone.xpi)

open it / associate it with Firefox
then the add on manager will open & you can install it
Then, right click in the toolbar, say near the search section, & select Customise
Drag the netusage item over to the toolbar
Then configure it
& you are in business!

You can download it from here

Word of warning

1/ Its still a summary meter, so it may be up to 24hours behind

2/ it includes both UP & DOWN, so if you are on ADSL One you need to remove the UP portion

(I will fix this eventually )