1369153 - Bug 1363852 resurfaced - Firefox+Flash in Windows Display 150%

Status: RESOLVED WONTFIX

(Core Graveyard :: Plug-ins, defect, P3)

Description

[Dale]

Attachment: Firefox+Opera+Flash_Win7-150percent.png

User Agent: Mozilla/5.0 (Windows NT 6.1; rv:54.0) Gecko/20100101 Firefox/54.0
Build ID: 20170529025116

Steps to reproduce:

Upon reporting this bug previously (1363852), I was encouraged to install Firefox 54.0b6 (32-bit). I did so, and the bug appeared to be resolved. However, when Firefox autoupdated to  54.0b7 the issue resurfaced, and has remained through the current 54.0b12 update.
Win7Pro-32bit + Firefox 54.0b12 (32-bit) + Opera (45.0.2552.888 (PGO) + 
Flash NPSWF32_25_0_0_171.dll

1. Set windows display setting to 150%. (viz. display resolution in Windows 7 is set to 150%, not the zoom level in the tab of Firefox.)
2. Open web file containing Flash application.






Actual results:

Video out of sync; interactive features do not work properly (e.g. selection from a list is requested - selection is made but does not appear, but clicking anywhere in the window causes the selection to appear.)
Test case: https://www.math.ksu.edu/~dph/vl/010/lec11/



Expected results:

Video should play normally; interactive elements should display and respond after user input.
NOTE: I tested this with the same 150% display setting and same web page, but using Opera (45.0.2552.888 (PGO). The video played correctly and the interactive elements operated correctly.
(See attached file.)

Comment 1

[Jim Mathies [:jimm]]

These are wmode=transparent, so bitmap based sync rendering path. Might simply be a bad performance problem.

Comment 2

[Dale]

Greetings. I wanted to communicate that today Firefox updated to 55.0b3 (32-bit) and the bug seems to be resolved. This happened previously, but in the next update the bug resurfaced. I will continue to post on this thread whenever Firefox updates to keep everyone apprised of the situation. Many thanks to all the team.

Comment 3

[alex_mayorga]

https://www.adobe.com/products/flashplayer/end-of-life.html