I've been having the same issue. Just mash the button a lot with your mouse. If that doesn't work, close out of the browser (completely out), re-open the browser, and try again.
If you can get to the setting menu then that check mark is nice, although i've found that i also have to click many times for it to be recognized.
If you clear your browser settings/cache/etc to keep your browser running cleanly, it will clear out that preference and you'll have to do it again.