The roads I take...

I've been talking about Data Manager here before, the central access point to all kinds of data stored within SeaMonkey and Firefox, like Cookies, Content Preferences, Permissions, and Form Data, all within an about:data tab in the browser.

The current 0.7 version allows all the data to actually be managed, but dynamic updates of the UI on data changes are not fully implemented yet.
The actual functionality works and is stable enough for common use in my internal testing.

And now, it's a public add-on for Firefox and SeaMonkey on AMO!

Feel free to download it and play with it, I think it has some potential. In the meantime, I'm working on those dynamic updates of the UI when data changes, and I made some progress today in detecting what actual entries have changed, so that in a next step, I can actually get the UI updated for those. I hope I will make progress on that soon.

Until then, please test the current version of the add-on and tell me what positive and negative experiences you make with it (except for the lack of dynamic updates, which is the only really known issue).