Some websites do things to stop addons like this from working, and I can't change that. But the addon definitely works on sites that don't take such countermeasures. I use it myself in the latest firefox, as do many other happy reviewers. Don't use reviews for misplaced and false bug reports, they belong in an email with proper information like which site you're trying to use it on. Simply writing "doesn't work" is an utter waste of everyone's time and blatantly wrong.