After I choose an extension and version, the generated page says
"The tar archive should be extracted into your extensions directory. For example, on a unix-like OS:"

Avoid passive voice when conversing with the reader, especially when it sounds like it's saying what the browser will normally do. Also capitalize Unix, so:
"You should extract the tar archive's contents into the <tt>extension</tt> directory of your MediaWiki installation. For example, on a Unix-like OS:

Similarly
"It may be used for immediate download to a server, but please do not bookmark it, since the contents will not be updated..."

should be:
"You can use this link to download the extension on any computer, but please do not bookmark it, since its contents will not be updated..."

Version: master
Severity: minor