Firefox - What to do with file- message box problem

[oAJAXo]

Hi
when downloading in Firefox a message/option box opens asking What should Firefox do with this file?. You can select an application to open the file-type and Firefox remembers the selection. Next time you download a same file-type, the message/option box opens with the option selected.
The problem is there is a tickbox with "Do this automatically for files like this from now on.". The tickbox is greyed out.
Does anyone know how to set the default to true (ticked). So the process would be automatic and the message box will not open and wait for a click event?
Thanks. AJ

 

[Tradesman1]

May not have a default option set up in the system, this might help:

https://support.mozilla.org/en-US/kb/change-firefox-behavior-when-open-file

 

[oAJAXo]

May not have a default option set up in the system, this might help:

https://support.mozilla.org/en-US/kb/change-firefox-behavior-when-open-file

Thanks for this, although this wasn't the problem it did lead me to the following.

Unable to set an automatic action

In some cases, you may not be able to set an automatic download action. This can occur when a misconfigured web server assigns an incorrect MIME type, such as "application/octet-stream", [strike]shown here in SeaMonkey 1.x[/strike] or if the server assigns "Content-Disposition: attachment" to the file download, [strike]as shown here in SeaMonkey 1.x [/strike]( the MIME type of a downloaded file, and whether it should be handled as an attachment, does not appear in Firefox or in SeaMonkey 2). [4] [5] When this happens, the option to always perform the same action will either be "grayed-out" or, in Firefox, selecting the "Do this automatically" option will not seem to have an effect and you will again be asked what to do when you next encounter that file type (see below for related bug reports). There is little you can do in these cases because the problem is at the server end.

Thank you.