Firefox's Pinned Tabs in Safari Is there a way to mimic Firefox's Pinned Tabs in Safari on Yosemite?

I love the Pinned tabs in Firefox because they allow me to easily keep a few key tabs (webmails, calendar, todo list) open without them taking up too much space. But I love Safari because it syncs with all my other devices.

I tried to search for extensions that do this, but was unable to find any.

Note: Pinned Tabs (or App Tabs) offer several functionalities:


they allow you to select tabs that should always be loaded when Firefox starts
these tabs are minimally represented in the tab bar
these tabs stick to the domain, e.g. eternal links are opened in new tabs by default
these tabs are difficult to close (e.g. [cmd]+W is ignored)


See this screenshot (gmail and twitter are pinned), or the documentation
The only way you can really emulate this is if you create a Safari Extension for each website which you can put whatever picture you want for the buttons background. Don't think that's something really fluid in terms of work flow and realistic fixes, but trying to alter hard coded UI elements isn't easy to do for every day users. 

Note: Creating an extension will require a developer certificate, but this is the closest option to your desired result https://developer.apple.com/library/safari/documentation/Tools/Conceptual/SafariExtensionGuide/UsingExtensionBuilder/UsingExtensionBuilder.html