This is my startpage. It's a Sunday-afternoon project that I threw together after seeing the Currently extension for Chrome, as far as I know there's nothing similar for Firefox. This isn't a browser extension, though, it's just a page I have set up locally.
License: MIT
I didn't really write this for other people, so if you want to use it you'll probably end up having to change a few things (e.g. the interface isn't "responsive" at all, so you may have to adjust for your monitor's resolution). Here's how to set it up, though, on Ubuntu 12.04:
~ $ git clone https://github.com/alxlit/startpage startpage
~ $ sudo apt-get install tasksel
~ $ sudo tasksel install lamp-server
~ $ sudo vi /etc/apache2/sites-available/default
<VirtualHost *:80>
ServerName startpage
DocumentRoot /home/[user]/startpage
<Directory /home/[user]/startpage>
Options Indexes FollowSymLinks MultiViews
AllowOverride all
Order allow,deny
Allow from all
</Directory>
</VirtualHost>
~ $ sudo vi /etc/hosts
127.0.0.1 startpage
~ $ sudo /etc/init.d/apache2 restart
Then change your homepage in Firefox to "startpage," and optionally change
browser.newtab.url
in about:config also.
The icons are Meteocons, and the font is Raleway, which comes with elementary OS.