1468941 - Some of the changes made using CCK2 config (in an old Firefox) are still available after update to the latest Nightly

Status: RESOLVED WORKSFORME

(Core :: AutoConfig (Mission Control Desktop), defect)

Description

[roxleitan]

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:62.0) Gecko/20100101 Firefox/62.0
Build ID: 20180613220131

Affected versions]:
Nightly 62.0a1

[Affected Platforms]:
Windows 10 x64, Mac OS X 10.13

[Preconditions]:
1.Install Firefox ESR 52: http://archive.mozilla.org/pub/firefox/releases/52.0esr/
2.Install CCK2 addon in Firefox ESR 52(downloaded from here:https://mike.kaply.com/cck2/)
3.Customize default search engine(Duck Duck Go), permissions for a website and block private browsing using CCK2 
4.Install an old Firefox build - without autoconfig sandbox(e.g. http://archive.mozilla.org/pub/firefox/nightly/2018/04/2018-04-03-10-01-05-mozilla-central/) and move the customized cck2 file into Firefox Nightly folder
* please make sure that autoconfig.js file contains:
pref("general.config.filename", "cck2.cfg");
pref("general.config.obscure_value", 0);
pref("general.config.sandbox_enabled", true);

[Steps to reproduce]:
1.Launch Firefox with a new profile (old version)
2.Update to the latest Firefox build 

[Expected result]:
The updated Firefox should not contain any changes made using CCK2 file

[Actual result]:
The default search engine is Duck Duck Go and the permission for the website are 
the ones set using CCK2 file, but the private browsing is not blocked anymore

[Note]:
If Firefox (latest build) with CCK2 files is opened with a new profile, the default search engine is Google, the permissions for the website are not customized and the private browsing is not blocked

Comment 1

[Mike Kaply [:mkaply]]

The CCK2 doesn't remove its settings when uninstalled, so this is working a expected.