518579 - On force-reload, images are always fetched from the server, even if they're used elsewhere

Status: RESOLVED DUPLICATE of bug 497665

(Firefox :: General, defect)

Description

[mozilla]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3

When force-reloading (Ctrl+Shift+R or Ctrl+F5) a page which has numerous instances of a few images, Firefox requests each and every image from the server, apparently unaware that it's already retrieved that image. Initial page loads and normal reloads (Ctrl+R or F5) do not show this problem, and interrupting the force-reload with a 'regular' reload loads all the images from cache.

Reproducible: Always

Steps to Reproduce:
1. Go to a page with many instances of a few images (for example http://dev.pgengler.net/firefox/cache/)
2. Note that on the initial page load, the images load quickly, as Firefox only request each one once.
3. Force-reload the page by pressing Ctrl+Shift+R or Ctrl+F5.
Actual Results:  
Firefox requests every instance of each image from the server. (You can see that for images further down in the page, the alt text is displayed, and you can watch each image get loaded).

Expected Results:  
Firefox requests each image once from the server and loads the other instances from the now-cached copies.

This is not a problem with Firefox 3.0.x.