This is rather nice, and seems to have been released in the last few days. A new Chinese Language translation add-on for Firefox, where the language of the web page is auto-detected and the translation happens seamlessly within the existing page layout. There’s no messing around with tedious right-clicking, highlighting, hovering over buttons, etc. This is one of the first of many such add-ons, I would hope. Future browsers should have this built in, for all the major languages.
The only problem at present it that it’s rather too seamless. Users need a little visual flag to show when it’s been applied to a page. And perhaps a “toggle” button.