1221333 - 100% CPU when playing Flash video in fresh profile; Firefox/Chromium CPU usage graph comparison

Status: RESOLVED WONTFIX

(Core Graveyard :: Plug-ins, defect)

Description

[tyaremco]

Attachment: Firefox troubleshooting info

My machine is a Lenovo x201s built in 2010.  Its graphics adapter is a Mobile Intel(R) 4 Series Express Chipset Family and its CPU is a Intel Core 2 Duo L9400.  Firefox cannot play Flash video smoothly on this machine.

I played a short flash video in both the recent Chromium and Firefox and logged their CPU usage.  The result is almost unbelievable.
https://sli.mg/a/5QoQOL

- This test is done on a new profiles.
- Both browsers have uBlock Origin installed (the issue is unrelated to this extension)
- I have tested in the latest nightly with e10s enabled and the result is the same.
- Flash hardware acceleration is enabled for both plugins.  I have disabled hardware acceleration in the Firefox plugin and the result is the same.
- This is not a new regression.  Firefox has performed this way for some time.
- My graphics chipset drivers are up to date.


1) How can a modern browser integrate so poorly with a well-established plugin as to render the plugin useless on a 5-year-old ultraportable?

2) Even if Mozilla has no intention of supporting my hardware is this the expected level of performance?

Comment 1

[tyaremco]

Workaround:

Get a Greasemonkey script that forces the flash object's wmode parameter to "direct".  
https://greasyfork.org/en/scripts/8914-direct-wmode

This bug is well-defined and very detrimental.  I can't believe it exists in 2015.

Comment 2

[BMO Automation]

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