Flickr (Pin Tab) od Senthil Ponnusamy

NOTE:
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Features:
- Zero configuration.
- Single click to access.
- Cross-platform (Windows, Linux, MacOS X).

Pinned Tab Features:
- Pinned Tabs are small
- Pinned Tabs don't have a close button. so you can't accidentally close them.
- You can still close them by right-clicking on them and selecting Close Tab.
- Pinned Tabs notify you with a blue highlight (glow) when they change.
- Links to other websites open in a new tab so that your Pinned Tab doesn't change.
- All of the existing Pinned Tabs (when you close Firefox) will open as Pinned Tabs
when you start Firefox again.
-Additional information about Pinned Tabs http://mzl.la/1BARsAT