586193 - Some pages are not displayed, but a message "Found" or "Moved Temporarily" appears

Status: RESOLVED DUPLICATE of bug 584759

(Firefox :: General, defect)

Description

[Wojciech Moch]

User-Agent:       Mozilla/5.0 (Windows NT 6.0; rv:2.0b4pre) Gecko/20100810 Minefield/4.0b4pre ( .NET CLR 3.5.30729; .NET4.0C)
Build Identifier: Mozilla/5.0 (Windows NT 6.0; rv:2.0b4pre) Gecko/20100810 Minefield/4.0b4pre ( .NET CLR 3.5.30729; .NET4.0C)

Some pages are not displayed at all, but a page with the message "Found" or "Moved Temporarily" with a link to where the document *should* be. In most cases clicking the link only causes the "Moved Temporarily" message to reappear.

Reproducible: Always

Steps to Reproduce:
1. Enter an URL. This happens almost every time for Google pages, but occasionally happens also for other sites (including Bugzilla).

Actual Results:  
Some pages are not displayed, but a message "Found" or "Moved Temporarily" appears

Expected Results:  
The page being actually displayed, perhaps?

I suspected some add-ons interaction, but disabling the recently updated ones did not do any good.

Comment 1

[Jo Hermans]

Are you using a proxy server ? Firefox on its own would not generate a page with the redirect link, but will follow the redirects immediately. It looks to me that it's either a mistake on the webserver itself (showing a real redirect page instead of sending back a redirect response), or from a proxy server in between.

Do you also see it in Safe Mode ? If not, that would mean that there's an add-on that is causing it.
http://support.mozilla.com/en-US/kb/Safe+Mode

Comment 2

[Wojciech Moch]

(In reply to comment #1)
> Are you using a proxy server ? Firefox on its own would not generate a page
> with the redirect link, but will follow the redirects immediately. It looks to
> me that it's either a mistake on the webserver itself (showing a real redirect
> page instead of sending back a redirect response), or from a proxy server in
> between.

Yes, i'm using a proxy, but the proxy messages look quite different from those i'm becoming recently. As for the webserver mistake... i doubt that, as it would mean, the same mistake occurred on several sites at the same time.

> Do you also see it in Safe Mode ? If not, that would mean that there's an
> add-on that is causing it.
> http://support.mozilla.com/en-US/kb/Safe+Mode

Ok, i did what You asked, and have to say that in the SafeMode everything works all right. Previously i just disabled add-ons that updated recently, so it has to be some of the older ones.
I'll try to sort that out, and post an update.

cheers
Wojtek Moch

Comment 3

[Jo Hermans]

it's AdBlock Plus

Comment 4

[Wojciech Moch]

(In reply to comment #3)
> it's AdBlock Plus

Confirmed! I'm using Adblock's development builds, and even the latest one does not work well with current Minefield.