Microsoft confirmed that a bug in Microsoft Edge was continually disabling AdBlock and other extensions. About 10% of Microsoft Edge users were affected. The Windows 10 update released on December 9, 2016, should have fixed it, but it's possible it could return every time Windows (and thus Microsoft Edge) is updated.

If you're still finding that your extensions are disabled when you start Microsoft Edge, please report it to Microsoft to help with their ongoing investigation. Here's how:

  1. Click the Microsoft Edge More (...) menu and select Send feedback. (The More menu button is the three horizontal dots in the upper right corner of the window.)
  2. Choose Microsoft Edge > Extensions as the category and subcategory.
  3. Be sure to include the phrase "AdBlock disabled" in your report.

In the meantime, if you're seeing ads please make sure that AdBlock is turned on in Microsoft Edge's extension settings. And then, if you're still seeing ads, check out these suggestions.