558884 - disabling a plugin doesn't cause other plugins to be used

Status: RESOLVED DUPLICATE of bug 544016

(Core Graveyard :: Plug-ins, defect)

Description

[Brian Postow]

User-Agent:       Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3
Build Identifier: 3.6.3

I have a TIFF Viewing plugin. Quicktime is also a TIFF Viewing plugin. When I start Firefox, Quicktime gets used. if I disable Quicktime, the space where the image should be turns white (or whatever the background is). If I restart Firefox, the area is still blank. 

If I remove the Quicktime plugin from /Library/Internet Plug-ins and re-start Firefox, my plugin activates and everything is fine. 

SOMETIMES, after putting Quicktime back in /Library/Internet Plug-ins, my plugin is still used, sometimes it's Quicktime, but either way, deactivating Quicktime rarely seems to make my plugin be used.

Reproducible: Sometimes

Steps to Reproduce:
1. Attempt to view a TIFF (using Quicktime) (http://www.acordex.com/browseProd/AVTtest.html)
2.Install Accel ViewTIFF (http://www.acordex.com/browseProd/AVThome.html)
3. again, attempt to view the tiff. (It MAY use Accel ViewTIFF, it may not. If it does use accel ViewTIFF, you can't really test anything...)
4. If it used Quicktime, deactivate Quicktime in the tools menu. The image area will go white.
5. Restart Firefox, the image area will STILL be white.
Actual Results:  
Image was not shown in the new plugin, it attempted to show it in Quicktime, failed (Because Quicktime was disabled) and then just gave up.

Expected Results:  
It should have gone to the next plugin that could handle TIFF files.

Comment 1

[Boris Zbarsky [:bzbarsky]]

I thought Benjamin checked in a fix for this.  Is that trunk-only?

Comment 2

[Brian Postow]

(In reply to comment #1)
> I thought Benjamin checked in a fix for this.  Is that trunk-only?

Is it possible that the fix hasn't made it's way into the distrubuted FireFox yet?