[troels]

Ah yes, but how can I trust that "Extension Gallery and Web Store Inspector" is safe to install?

[RyanMcGreal]

Obligatory: http://xkcd.com/250/

[cosgroveb]

I'm not sure how you can download an extension before installing but in Ubuntu after you've installed it you can look at the source under ~/.config/google-chrome/Default/Extensions/ (or in Windows C:\Users\You\AppData\Local\Google\Chrome\User)

[d0vs]

You can inspect it too