Last.fm Scrobbler is created for people who listen to music online through their browser, and would like to keep an updated playback history using Last.fm's scrobbling service.
IF THE EXTENSION STOPS WORKING, REPORT ON GITHUB ONLY: https://github.com/david-sabata/web-scrobbler/issues
You should click on a notification that is shown when the extension is loaded first time. Then, you should grant access to your Last.fm account.
The scrobbler status is shown on the right side of the address bar. Optionally you can enable desktop notifications of now playing songs.
You can manually correct the song title by clicking on the scrobbler icon, if the song doesn't get recognized. Just click on the question mark icon and fill correct song info.
See the options page for more information.
You can view a list of supported websites at this page: https://web-scrobbler.github.io/.