This is an issue I am experiencing on Persian Wikipedia (FAWP) for the last
couple of weeks. I have replicated it in different machines, and after
clearing the cache (or using incognito). I have replicated it in Firefox
and in Chrome.
When you open a page, some times certain widgets (e.g. Twinkle) or
user-specific JS scripts don't load. Refreshing the page will fix it 99% of
the time (that 1% requires refreshing 2 or 3 times).
Looking at the console shows an error that indicates "mw.util" is not
defined. See the error message in Firefox and Chrome But because none
of the scripts have changed recently, to me it means somehow that mw.util
is not loaded *some of the time*.
The problem manifests itself mostly when you open a tab in the background
(i.e. you middle-click a link), and especially when I open several tabs in
If I turn ResourceLoader off, the error does not occur. So I am thinking it
has to do with RL. Any ideas on the next steps to investigate this are