You can also make a bookmarklet that loads Google Translate into the page. It isn't quite as nice as the auto-detect in Chrome but very close.
With the new offline translation support I actually prefer this setup as I can try the local translate first, then if the quality is bad or the language isn't supported I can make the decision if I want to upload the page to Google.
Also, there’s an offline translate extension being worked on in open source: https://blog.mozilla.org/mozilla/local-translation-add-on-pr...