Highlighted or colored pinned tabs for easy memory.

[ArcaneAutumn]

How about some kind of highlight, or color on pinned tabs that you want to keep in mind to check?  

~Michael 

[Jon]

Thanks for submitting an idea to the Mozilla Connect community! Your idea is now open to votes (aka kudos) and comments.

[Jon]

Similar idea (though not specifically for pinned tabs) here on Connect:

Highlighted / Colored Tabs