*.XPI should be associated with Firefox in KDE

Either Firefox should advertise support for this mimetype, or shared-mime-info should differentiate is from a zip, but there's nothing on dolphin's end that can really be done.

Thank you for reporting this to Ubuntu. While .xpi files are used in Firefox, there are also used in other applications based on xulrunner such as Thunderbird or Songbird. It is not clear from the extension which application should be opened. Therefore, I am marking this as won't fix.
Please feel free to report any other issues you may find.

But opening them as zip-file is in most cases also not the choice. I do not know how it is in Gnome, but in KDE there is the possibility to associate with more then one filetype and sort by priority. I think it is a reasonable assumption that most extensions are used in Firefox, so Firefox would be priority one then and then others follow. So please reconsider your decision.

No, it's not the obvious choice as Thunderbird and other xulrunner based
apps use the same file format. I would think that most people that
install Firefox extensions do it from within Firefox. In that case,
they never even see the .xpi file. I would suggest you make a proposal
on http://brainstorm.ubuntu.com/ and see what type of feedback you get.
I discussed this with the maintainers of the package and the result was
the current behavior is good for now. See what happens on brainstorm
and then maybe we can revisit this.

Mark wrote:
> But opening them as zip-file is in most cases also not the choice. I do
> not know how it is in Gnome, but in KDE there is the possibility to
> associate with more then one filetype and sort by priority. I think it
> is a reasonable assumption that most extensions are used in Firefox, so
> Firefox would be priority one then and then others follow. So please
> reconsider your decision.
>
>

Thanks for the report, it has been some time without any response or feedback in this bug report and we are wondering if this is still an issue for you with the latest release of Ubuntu the Natty Narwhal, May you please test with that version and comment back if you're still having or not the issue? Please have a look at http://www.ubuntu.com/download to know how to install that version.Thanks in advance.

We're closing this bug since it is has been some time with no response from the original reporter. However, if the issue still exists please feel free to reopen with the requested information. Also, if you could, please test against the latest development version of Ubuntu, since this confirms the bug is one we may be able to pass upstream for help.

The problem still exists. What should I say else. It is easy to reproduce.