238244 - Firefox doesn't start when general.useragent.override is set to MS Internet Explorers User Agent.

Status: VERIFIED DUPLICATE of bug 83376

(Firefox :: General, defect)

Description

[mozilla.org]

User-Agent:       Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; de-DE; rv:1.6) Gecko/20040318 Firefox/0.8

I use the Extension "User Agent Switcher", which makes it easy to switch the
User Agent. A few days ago I forgot to set the User Agent back to "Default" and
Firefox denied to start "with a browser version < 5".
After removing the line "general.useragent.override" all worked fine again.

Reproducible: Always
Steps to Reproduce:
1. set general.useragent.override to "Mozilla/4.0 (compatible; MSIE 6.0; Windows
NT 5.1)
2. shutdown Firefox
3. try to start Firefox

Actual Results:  
A warning message appears. Firefox doesn't start until the useragent is
corrected in the file prefs.js

Expected Results:  
Start the browser (with a modified user-agent)

Comment 1

[logan]

WFM

Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7b) Gecko/20040321 Firefox/0.8.0+

Comment 2

[Jesse Ruderman]

If disabling Java fixes it, this is a dup of bug 83376.

Comment 3

[mozilla.org]

Disabling Java helps indeed. I never thought that this could be a Java-bug
because the error-message says nothing about Java:
----
INTERNAL ERROR on Browser End: Expected a version > 5! Version = 4
 
System error?:: Datei oder Verzeichnis nicht gefunden
----
The last line is partly german and means: "File or directory not found"

*** This bug has been marked as a duplicate of 83376 ***