422561 - Handlers not removed from preferences after Handler is uninstalled

Status: NEW

(Firefox :: File Handling, defect)

Description

[cmtalbert]

On Vista, the protocol/content handler application is not removed from our preference settings after the protocol/content handler is removed from the system.

BuildID: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9b5pre) Gecko/2008031205 Minefield/3.0b5pre

Follow the steps in these testcases:
https://litmus.mozilla.org/show_test.cgi?searchType=by_id&id=4620
https://litmus.mozilla.org/show_test.cgi?searchType=by_id&id=4621

Or to genericize this:
1. Install handler x, for the protocol x://
2. Start firefox, try to browse to the URL of x://foo
3. Note that handler x is started
4. Uninstall (via the OS) handler x
5. Restart Firefox (in an ideal world you wouldn't even have to restart)
6. Try to browse to x://foo

== Actual ==
When you attempt to browse to the URL in step 6, note that the application launch dialog appears and lists the original handler x (now missing an icon) as a valid handler for this protocol.

You can also verify that handler x is still listed in the Applications tab on the options dialog

== Expected ==
Handler x would be removed from the application launch list once the handler is uninstalled.

== Platform Issues ==
Seems to be Windows specific. Need to test on Linux, but I'll have to reboot first.  It does not happen on OS X.