294515 - Extension's about:config entries remain after uninstallation of extension

Status: RESOLVED DUPLICATE of bug 258301

(Toolkit :: Add-ons Manager, defect)

Description

[samuella]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.8) Gecko/20050511 Firefox/1.0.4
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.8) Gecko/20050511 Firefox/1.0.4

Data about uninstalled extensions still lingers in about:config even after
uninstallation of extension. 

Reproducible: Always

Steps to Reproduce:
1. Install an extension
2. Uninstall that extension
3. In the address bar, go to about:config and in the filter bar, type the name
of the uninstalled extension

Actual Results:  
You will see that the extension's preferences are unneccessarily (I assume)
stored there after uninstallation of extension.

Expected Results:  
Uninstall preferences and data as well as the extension itself.

Comment 1

[Steve England [:stevee]]

AFAIK this is by design. The entries left in about:config won't slow anything
down, and won't add to memory usage or anything at all, whilst it allows users
to uninstall extensions without loosing all their settings.

Comment 2

[Steve England [:stevee]]

*** This bug has been marked as a duplicate of 258301 ***