>>! In T89457#1538523, @Mormegil wrote:
> I went to a foreign wiki I have never visited before and as the first step after my account was autocreated there, I went to [[Special:Preferences]] to change the UI language to something I can cope with. With the JS still loading and the page displayed as one big list instead of the tabbed interface, I changed the language; then the JS finished loading and the display switched to a nice tabbed interface… with the //Save// button disabled, since I modified the setting prior to the script run. So I needed to change something there and back again in order to be able to save the language setting.
>
> Just saying.
In other words: When the javascript is not fully loaded, but you will change some preferences, the check for the button will not see this changes.