TwitterBar allows you to post to Twitter from Firefox's address bar.
JavaScript Shell
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bird-throbber
twitterbar-client
twitterbar
README.md
build-xpi.sh
license.txt
locale-cleanup.sh
remove-bad-locales.sh
skin-cleanup.sh

README.md

TwitterBar allows you to post to Twitter from Firefox's address bar. A small unobtrusive grey icon sits to the right of your address bar; clicking on it will post your tweet, and you can hover your mouse over it to see how many characters you have left.

You can also post by typing "--post" at the end of your tweet. Clicking the grey icon when visiting a webpage will send a tweet with the URL of the webpage you are currently viewing.