1. Make sure you are logged inGo to the English Whttps://en.wikipedia.org/
2. Go to https://en.wikipedia.org/wiki/Special:Watchlist with Firefox v61.0 (64-bit), v62.0b3 (64-bit), Safari v11.1.1, or Internet ExplorerMake sure you are logged in.
3. Click on "Preferences" in the top right.
4. Click on the "Beta features" tab, the second from the right.
5. Enable "New filters for edit review"
6. Click "Save" at the bottom of the page.
7. Go to your Watchlist by clicking it on the top right, near "Preferences", or by going to https://en.wikipedia.org/wiki/Special:Watchlist
8. The blue markers to the left of each diff entry in my Watchlist (which are solid if the change has not yet been viewed and empty if it has) aren't appearing. When the page is loading, they do appear, but only for about half a second, and then once the page has fully loaded, they disappear.