One of three fake extension by this developer, the only one that isn't completely non-functional. It's essentially a couple lines of code swaddled in extension boilerplate, appending text to a single string in local storage. Useless, except as a test (his only successful test, yay?) but not dangerous.

Shame shame SHAME on you, Mozilla! You warn the faithful "Make sure you trust it before installing." but that's completely asinine advice. Back when Firefox still counted one could inspect the extension code on this site before installing it - that at least gave users a fighting chance to identify malefactors and miscreants. Back when Firefox still counted you had a crew of volunteers who installed and evaluated new extensions and updates to detect malefactors and miscreants before sending them on to your users. Whatever happened to that volunteer workforce?