> Could it be the normal HTTP Cache ? see
> https://bugzilla.mozilla.org/show_bug.cgi?id=834285

I think thats the problem.

> Try to set the http cache headers for manifest files, using a "expire
> asap" header. On Apache, this is like this:

This is the .htaccess file :

AddType text/cache-manifest .manifest
<IfModule mod_expires.c>
ExpiresActive On
ExpiresByType text/cache-manifest "access plus 0 seconds"
</IfModule>

The problem still exists with those settings.
 
> have you tried with "location.reload" instead of "history.go(0)" ?

Most commands are blocked, because pages from another domain are loaded in the 
frame (xframe scripting security), so i dont think that location.reload will 
work. But the external pages use a javascript library that gives them the 
ability to receive messages (window.addEventListener ("message", OnMessage, 
false);).
So I could solve the problem by sending a command with "window.postMessage".

Berni

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