Proofreading and editing tools related to MediaWiki:TemplateScript of Pathoschild are disabled and no longer accessible in the sidebar. This applies to Firefox. The tools are available in Chrome. Also, this bug is related to, but not the same as https://phabricator.wikimedia.org/T138554.
Also, there are problems listed posts, all related to the same time frame.
Have you looked at my common.js? It worked before the wmf update.
Hi @Ineuw, thanks for taking the time to report this!
Unfortunately this report lacks some information. If you have time and can still reproduce the problem, please add a more complete description to this report. Ideally, a list of exact and clear steps to reproduce, step by step, should allow any other person to follow these steps (without having to interpret those steps) and see the same results.
Problems that others can reliably reproduce can get fixed faster.