1) Twitter Search: Twitter is now included as a search option in Firefox for Windows, Mac and Linux. Twitter search in Firefox makes it easier to discover new topics, #hashtags and @usernames. Twitter search is currently available in English, Portuguese, Slovenian and Japanese versions of Firefox, with more languages to come in future releases.
Windows(English) - Download
Mac(English) - Download
Linux(English) - Download
If you want other language firefox browser to to this link and select your language and download firefox. It is available in 70 different language around the world.