Cheevos is an addon for Firefox that makes learning about different parts of the browser fun, as well as giving you the opportunity to brag to your friends about your pro-level web surfing.
Cheevos should sync achievements between browsers, which will also allow for backups and restoration of achievements if a machine gets lost or profile gets corrupted.
It doesn't appear that Cheevos is working in Firefox 29. Or at least the about:cheevos URL is not working, I am just getting 'The address isn't valid' error. I'm also not sure where you find the options for Cheevos in Fx 29 (assuming the was any).
When I close the FF window with the red button (Mac: Top-Left) it reset the points in the icon/button to zero, in about:cheevos they are still correctly displayed.
Edit: Very minor issue, since properly quitting Firefox and starting it resolves it. Possibly only Mac since on Win clicking "X" quits FF entirely.
It should be possible to have a task which involves reopening tabs or restoring previous sessions in Firefox.
I don't have any code to go along with this right now, but I might have a shot at it later on when I've got more time, if not anybody else has made it.
With the Personal Menu extension enabled (https://addons.mozilla.org/en-US/firefox/addon/personal-menu/), the Cheevos menu item won't appear in the Firefox button (only the Tools menu in the traditional menu), and any attempt to view about:cheevos results in an error. As much I'd like to try this, I really need Personal Menu.
Having failed to access Cheevos via a menu item due to issue #3, I checked the screenshots on AMO and saw that there should be something at about:cheevos, but typing this address directly in the menu bar got me the message "The URL is not valid and cannot be loaded."
I unlocked Yo Dawg, and the block is lit up and I get the link, but the award itself isn't lit. Looking at the CSS, it's missing the achieved attribute (although it does have the date when it was achieved).