fcitx-sogoupinyin is currently the best choice, and ibus-sunpinyin is another good alternative.

Chrome Extension

Firefox Extension

http://toshuo.com/chinese-tools/pinyin-input-firefox-extension/

Ref

http://www.pinyinput.com/?lang=en

Tips on Fcitx

Use Sogou Pinyin to Type Chinese

Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!

fcitx

1. Add Pinyin method: add -> type in pinyin, type in chinese doesn't help

IBus

1. I suggest you use CTRL + SPACE as the switching hotkey, because it's the default hotkey for most …