Board Thread:Support Requests - Getting Technical/@comment-32704847-20200331020432/@comment-9605025-20200331190104

You can get rid of it if you want but that announcement is about Firefox only. What Mozilla does with Firefox is not necessarily replicated across other browsers such as Safari, Chrome, and Edge just to name a few. The only time a change is likely (it is never guaranteed) to impact most/all browsers is when a change is made by W3C, the organization that manages the standards for things like HTMl and CSS.

As for examples of wikis, there are definitely some that use it. Even if they are not active, older wikis will tend to have them archived (i.e. you just can't edit them). Community Central is a wiki where they are archived. The Yu-Gi-Oh! Wiki is an example where they are still active. Although, links to it were recently removed from the local navigation as the current admin team is trying to encourage users to use Discussions instead.