I have the same issue. I'm on Version 90.xxxx. Since version 87 there have been constant issues with Bank Mode, Ad Block and Video downloader.
Having read this and other threads since verion 87. It appears support is not listening to the Video Downlader issue. Showing someone how to turn on a non-existent extension is not a solution. Rolling back to an earlier version is not a solution. Doing a Clean install is not an solution.
Regarding clean installs they're a complete pain because not all of the settings are restored. Export Bookmarks used to restore all settings as well as bookmarks. A new feature to restore all settings including White Lists and Auto Launch URLs for Bank Mode would reduce my reluctance to do a clean install in the future.
Version 90 appears to have fixed Bank Mode and and some of the Ad Block issues, but Video Downloader is still an issue. I have done two clean installs in the last two or three weeks which have wasted considerable time. I have attached an image of the resident extensions from a clean install from version 88 and Video Downloader is not there. So please listen to your customers when they say something is non-existent and provide a solution rather than assuming everyone is ill-informed about the basic functionality of the application.
Also it would be helpful if more than one image could be posted with each post to fully detail the many issues.