336611 - Can't install extensions

Status: RESOLVED DUPLICATE of bug 310737

(addons.mozilla.org Graveyard :: Plugins, defect)

Description

[Bob Hickling]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.3) Gecko/20060426 Firefox/1.5.0.3
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.3) Gecko/20060426 Firefox/1.5.0.3

Same results for any other extension, the URL specified is just the one I happen to be trying. 

When I poke the Install Now link on this page, an "error bar" appears which says:

"Software installation is disabled. Click Edit Options... to enable it and try again."

And there is an Edit Options button on the right.  So I poke it, and I get the standard Tools->Options... box.  Nothing seems to be about disabling the installation of options.  Help says that if Javascript is enabled, I will be able to install extensions.  I look again, Java and Javascript are enabled.  I looked more through the Options.  I fiddled with the only thing that looked related which was the "Warn me when web sites try to install extiosions" option.  No apparent effect.  

Reproducible: Always

Steps to Reproduce:
1.Go to the URL
2.Poke Install Now link a ways down the page

Actual Results:  
(If you have the right thing disabled) get the complaint in the "error bar"

Expected Results:  
It should have installed the Extension

Comment 1

[Cameron]

Type about:config in your location bar, then find xpinstall.enabled and toggle it to "true"

Note that this is in the release notes - http://www.mozilla.com/firefox/releases/1.5.0.3.html

*** This bug has been marked as a duplicate of 310737 ***

Comment 2

[Lynne Stevens]

I can't even get Firefox to install extention from its own site and I have in the 
"Warn me of sites installing extentions or themes" 6 copies of the URL of FIREFOX 
and Firefox is UP DATED toth latest 1.5.0.7