Thanks, used this in conjunction with a url editing add-on [0]
Description: Wikipedia Vector Skin
Example URL: https://en.wikipedia.org/wiki/Joseph_campbell
Include pattern: https://en.wikipedia.org/wiki/*
Redirect to: https://en.wikipedia.org/wiki/$1?useskin=vector
Pattern Description: Auto Redirects to vector skin version
Advanced Options:
Exclude pattern: https://en.wikipedia.org/wiki/*?*
Feel free to toss a better way or an improvement for this if you end up doing the same. I'm sure the include and exclude patterns can be tuned, the add-on supports regex, otherwise you'll want a second rule for searches and such, but this should get a person started.
I've made a Regex Version, which should support international wikipedia articles once the new skin arrives for them too.
Description: Wikipedia Vector Skin
Example URL: https://en.wikipedia.org/wiki/Joseph_campbell
Include pattern: ^(https?://)([a-z0-9-]*\.)wikipedia.org\/wiki/(.*)
Redirect to: $1$2wikipedia.org/wiki/$3?useskin=vector
Pattern type: Regular Expression
Pattern Description: Auto Redirects to vector skin version
Advanced Options:
Exclude pattern: ^(https?://)([a-z0-9-]*\.)wikipedia.org\/wiki/(.*)\?
[0] https://addons.mozilla.org/en-US/firefox/addon/redirector/