Using maintenance/install.php (TODO: test and confirm the parameter values; add some documentation to the file itself, as comments, and to its Manual entry):
?safemode=1 to load the page without gadgets/common.css/common.js (src)
?uselang=xx to load the page using the given language in the MediaWiki interface messages. Use the special value qqx to display the name of the interface messages instead.
?useskin=xx to load the page using the given skin for the MediaWiki interface style.
?debug=true to disable CSS and JavaScript minification
?safemode=true to disable all non-core styling and scripts: user-specific CSS and JS customizations (e.g. "User:JohnDoe/common.js"), site-wide scripts and styles (e.g. "MediaWiki:Common.js/css"), and all gadgets. May help with troubleshooting visual issues
Could there be a middle-ground mode to disable only user-specific customizations (including global scripts/styles), but keep site-wide ones and default gadgets?
Names.php is the master registry of languages supported by MediaWiki. This is not the same as languages of which MediaWiki will show l10n (JSON files) nor languages of which MediaWiki knows the names (via CLDR), mind you!
It could be interesting to make diffs flattrable. See Extension:Flattr.
For code review in gerrit, it would be nice to have a query url that shows only changes that haven't been reviewed before (in the "my changes" view, the CR column is often empty but there's already been a lot of discussion before, but a new patch reset the CR scores). Something like https://gerrit.wikimedia.org/r/#/q/reviewer:self+status:open+-is:reviewed,n,z should work, but according to the docs it covers both Code-Review and Verified scores, and the latter is pretty much always there as it's added by Jenkins, so the query shows nothing. One can build a query to show specifically patchsets with no Code-Review score, but that still doesn't fix the "previous discussion" issue above, which would enable one to find patchsets that haven't received any external feedback since being submitted. As an alternative to find unloved patches, one can amend that search query to show patchsets whithout CR that are over a year old (there are four such ones at the time of writing). Another approach is to limit to those who don't have a +2'er in the reviwers, by using -reviewerin:mediawiki in the query (the docs say reviewerin matches changes that have been, or need to be, reviewed by a user in the specified group).
Update: Krinkle on IRC says: the gerrit query command line API over ssh might have a way to filter for such things. Ask hashar or Reedy maybe next time they're on.
