For the curious:

Content-Disposition: What are the differences between "inline" and "attachment"? – Stack Overflow
https://stackoverflow.com/q/1395151/38108

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With Waterfox Classic, I switched from legacy 'InlineDisposition 2' to this extension (from the same developer) following an issue at an Adobe site. The issue is not reproducible with this extension.

Completely dysfunctional on Firefox 62.

Test: http://demo.borland.com/testsite/download_testpage.php

Firefox Quantum Dev - not working

not working

This addon does not work on ff 57

not working for me either on firefox 57.0

not working on FF57

Doesn't work, doesn't replace inline disposition. Still have to click open in dialog box every time ):

Not working FF 56.0b9

It's not working. If I look at the response in the Network tab, it still says "attachment; filename=..."

Need to add < all_urls > in permissions.

Need a support link so I don't have to report temporary issues here...
When this addon is off I have no issues, turn it back on and I experience the following:

Whether attempting to sign in to change password via gmail or google search page, or attempt to open gmail contacts I get a dialog... such as:
"Opening ServiceLogin"
ServiceLogin
which is: application/binary
from: https://accounts.google.com
What should Firefox do with this file?
(radio button) open with (choose button)
Save File
Do this automatically for files like this from now on.

Again, when I turn this addon off I have no problems signing in / don't get the dialog box. Enable this addon, the problem immediately returns.

Working as intended!! Huge thanks!
Edit: Since this a webextension any chance you can easily port this to the Chrome Store? I'm trying to switch to Vivaldi Browser and I miss this addon very much! There is an addon in the Chrome store which seems to want to do the same thing but it does not work.

tks