I cannot edit Extension:SimpleMathJax at all, literally even just one letter. It's a kind of weird. I've never seen like this. What happened to the mediawiki? :)
Topic on Project:Support desk
I can edit it just fine. Could you be more specific about your problem?
Oh, I misspoke. Actually, that means 'cannot save after edit', not just 'edit'.
What editor are you using? wikitext editor, visual editor, new wikitext editor?
What prevents you from saving? An error message (please specify which)? missing or disabled save button?
When I clicked 'Edit' button, It shows 'Source editing' mode. I edited version 0.3 to 0.5 in 'TNT|Extension' template and clicked 'Publish changes' button. And then, I clicked 'Publish changes' button again on the dialog. The dialog says "Something went wrong", "Translation unit markers in unexpected position. Translation unit text: The SimpleMathJax extension enables MathJax, a Javascript library, for typesetting TeX formula in MediaWiki inside math environments."
I've made the change for you.
MacFan4000, Thanks a lot. I found out it can be edited in the TNT template dialog in visual edting mode. I think there are restrictions for direct edit.