Everything contributed is Creative Commons Attribution 3.0 licensed.
Text, yes, but not images (or at least, that's how it should be). The strong majority of images are fully copyrighted and haven't been released under a free license; they should either be tagged as being used under fair use, or deleted if the wiki's policy is to only accept free images (which wouldn't make sense, considering that the nature of most articles requires copyrighted images, such as website screenshots, logos, etc.).
Pretty much every wiki runs this way; their text is freely licensed, but images are independently licensed as needed.
I don't see any exception for images.
Pretty sure website screenshots aren't copyrightable.
Similarly, logos may be trademarked, but I don't think copyrighted.
The wiki states "Content is available under Creative Commons Attribution 3.0 unless otherwise noted"; that "otherwise noted" consists of images, and pretty much every wiki functions this way (Wikipedia, Wikias, etc.).
And both screenshots and logos are definitely copyrightable. If the website consists of copyrighted work, so are any screenshots of it, as it's considered a derivative. Same goes for logos, save for the common exception when the logo is something simple, such as text (eg. Sony or Coca-Cola logos).
Edit: If you
don't want to take my word for itBut yea, we're digressing; still curious if user javascript could be made an option? Thanks!