1381264 - lagging with Firefox 54.0 + Flash 26.0 r0 (Linux)

Status: RESOLVED WONTFIX

(Core Graveyard :: Plug-ins, defect, P5)

Description

[Andy Hiscock]

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:54.0) Gecko/20100101 Firefox/54.0
Build ID: 20170612122310

Steps to reproduce:

Update Firefox (linux) from version 52 to version 54.  Flash version 26.0 (remains untouched before and after upgrade)


Actual results:

After upgrading Firefox (linux) to version 54 introduces serious lag when Playing Settlers Online (Web/Flash based game).  Lag seems to happen when the mouse is clicked.


Expected results:

No lag during game play as with previous version of Firefox.

Comment 1

[Andy Hiscock]

Have trued Ubuntu, fedora, Suse linux, all have the same issues.  All installations "upto date"

Comment 2

[Andy Hiscock]

Attachment: Screenshot from 2017-07-16 09-01-39.png

Attached screenshot showing plugins

Comment 3

[Benjamin Smedberg]

The probable cause of this is that we forced all Flash elements into windowless mode on Linux. This is a tradeoff we made to support multi-process browsing, and makes the browser faster in general but causes painting slowness for large Flash elements/games.

Given the declining state of Flash, Mozilla isn't going to dedicate a lot of engineering resources to this (P5). I'll leave this open in case somebody comes along and wants to do profiling and identify a problem we can fix.

Comment 4

[Andy Hiscock]

Is there a way to re-enable flash into windowed mode?

Comment 5

[Benjamin Smedberg]

No. The code that supports windowed mode has been completely removed.

Comment 6

[BMO Automation]

Resolving as wont fix, plugin support deprecated in Firefox 85.