1550940 - 66.0.x doesn't play local SWF files

Status: RESOLVED WONTFIX

(Core Graveyard :: Plug-ins, defect)

Description

[Pavel Hanak]

Attachment: flash_tree.swf from Adobe help page

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:66.0) Gecko/20100101 Firefox/66.0

Steps to reproduce:

Starting with version 66.0.x, Firefox doesn't play SWF files stored on local disk drives (online Flash content works fine). I think it may be connected with the recent expired certificate addon bug, but I'm not entirely sure. I tested this on an older computer where I had version 65 and local SFW files played fine there. When I updated it to 66.0.5, they stopped playing. One computer runs W10 64-bit CZ, the other W7 64-bit CZ, both have 64-bit Firefox, Czech localization.

Steps to test it:

1. Go to https://helpx.adobe.com/flash-player.html
2. You should see tree animation playing lower on that page.
3. Use Tools-Page Information-Media to save the animation (flash_tree.swf).
4. Use File-Open to play the file.

I'm also attaching the animation for convenience.

Actual results:

The SWF file is loaded, but not played (screen is white).

Expected results:

The tree animation should play.

Comment 1

[[:philipp]]

hi, this is the intentional default state since firefox 55:
https://www.fxsitecompat.com/en-CA/docs/2017/flash-can-now-be-loaded-only-from-http-https/