275607 - XPInstall fails if disk cache turned off ("Download Error")

Status: RESOLVED DUPLICATE of bug 262854

(Core Graveyard :: Installer: XPInstall Engine, defect)

Description

[Rick von Richter]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041217
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041217

When trying to install an XPI from the web the download windows shows "Download
Error" when you click on the "Install" button.

Reproducible: Always

Steps to Reproduce:
1.Install fresh install.
1a. Entries need to exist in your prefs.js. See Additional Info below.
2.Go to URL e.g. http://skypilot.projectit.com/all_american15b.xpi
3.Click on "Install" button.
Actual Results:  
XPI download window says "Download Error"

Expected Results:  
Should ask to install local or globally etc...

This only happens if the either of the following two entries exist in your
prefs.js file:

user_pref("browser.cache.disk.capacity", 0);
user_pref("browser.cache.disk.enable", false);

Comment 1

[Daniel Veditz [:dveditz]]

Reproduced in Firefox with cache disabled, but not with the size set to 0 for
some reason. But, obviously still a problem.

In Firefox there doesn't appear to be a problem with new-style extension manager
packages, this is somewhere in xpinstall proper.