Dev : Project ideas
From MozillaZine Knowledge Base
This is a page for developers who are looking for ideas to start hacking on. Users, please discuss it on the forums (in Features or Extensions sections) before adding your wishes here (to make sure requested extension doesn't exist yet). Nevertheless, developers should first search for an extension before implementing it.
If you're taking a project, please add a notice to the entry. Use signatures (four ~s), add contact information if possible.
When adding a new idea, be sure to explain it, preferably add a link to discussion or a detailed description. Non-detailed requests are less likely to be implemented. Add links to relevant b.m.o bugs. Use separate pages [Dev : Project ideas : ...] for really long ideas to make the list here easier to look through. Add new ideas to the bottom of the lists. Don't forget to mention the application you want to enhance (if applicable) - Mozilla/Firefox/Thunderbird.
I thought that it is a good idea to sort the requests by their difficulty, if you don't know how difficult to implement your request is, put it under "Unknown difficulty" list.
The extensions ideas