Flash video performance poor in Firefox 3 and other newer Gecko-based browsers; fails to detect mouse movement in full-s

Regardless of configuration, I have found Flash video
performance on Firefox 3 to be severely sub-par. Numerous visual
lags occur throughout a typical Youtube video as it cannot seem to
manage to maintain a steady frame rate. When in full-screen, mouse
movement is not detected, forcing me to click in a full-screen
Vimeo video in order to display its controls when I should have
only needed to move the mouse. I was informed that the technical
explanation for this is that Flash isn't triggering MouseEvents
other than MouseEVENT.CLICK.
In my tests, this behavior also occurred in Flashplayers 9
and 10 as well as with recent versions of other browsers that also
use the Gecko rendering engine, namely Camino, Flock and Songbird,
but not in Firefox 2. I was told by a Mozilla employee that this
issue can only be solved by Adobe.
This has forced me to use the Safari browser as my only
available work-around. I implore that these issues get resolved as
quickly as possible.

guys, im exactly experience the same issue here.. any
solution guys? tks in advantage..

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#In Add-ons > Plugins, do you see "Shockwave Flash ''(version)''"? If not, Flash is not installed for Firefox; see below
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'''If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.'''

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'''Adobe Flash'''
See if the following instructions help.
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My video on
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Ref :
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This is the most reported problem this week. Here's an entire thread of solutions that may or may not work:
https://support.mozilla.com/en-US/questions/776670
Looking through the thread, it seems like several different problems all manifesting themselves in the same way. Some people had to disable hardware acceleration in Flash, others had to delete their profile, and others yet just had to clear their cache... makes no sense.

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I have had this problem for a long time, running through all versions of Firefox 3 (including the latest 3.5 preview releases).
I am updated to the latest version of Flash, and am running Windows XP (also fully up to date).
All flash videos play fine in IE8.
On some sites, while videos are playing, the picture flicks quickly between a normal picture and the effect shown in the screenshot - the usual image tiny, with weird blurred lines around it. This continues through the whole video, flicking very rapidly, and making the video effectively unwatchable. The effect remains even when the video is paused. I've attached screenshots below which should make the nature of the distortion clear.
I have experienced the problem most on Youtube (as I use this more than other video sites). The only other site I have noted the problem on is facebook video. Metacafe, Google Videos, Dailymotion, Vimeo and BBC iPlayer did not exhibit any distortion.
On Youtube, it is sometimes possible to play videos properly by switching to high quality, but usually it does the same thing, but flicking to a much larger picture, so it only seems to be blurry around the very edges.
I should also mention that embedded YouTube videos play fine on other pages.
My computer is pretty old - with an AMD Athlon Processor 996 MHz and 752 MB of RAM - but definitely has the capacity to play these videos, as it manages on Internet Explorer.
I created a thread on the firefox support forums before I came here - not much progress was made, but I should mention a few details of the only other reported case of this problem.
"Matt" seems to be experiencing the same problem on Firefox, also with a pretty old computer, but on Windows 2000, not XP. He reports the same problem on Opera also on his computer; I haven't tested this on my system.
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Hello all,
Yes to follow up Ben, I'm experiencing the exact same problems as him. I changed browser to Firefox 3.0.11 a couple of months ago and hence downloaded the Flash plugin for Firefox. I noticed the issue straight away in Youtube, but not on other sites. As I attributed the problem to Firefox, I then downloaded Opera 9.64 - but experienced the same problem. This led me to believe the issue was the Flash plugin, as both browsers are served by the same Adobe plugin for 'alternative browsers' to IE.
I then tried IE6 again in youtube and it didn't have the problem on standard view, however the problem was (and still is) occurring in full screen view. I'm nearly 100% sure this problem didn't occur before I downloaded the Flash plugin for Firefox / Opera. Regardless of whether that is the issue, the problem was definitely not happening on my system in IE6 earlier this year.
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Any help appreciated, thanks.
Matt

Flash Player constantly crashes on Firefox and Chrome, works on Safari

Hello!
This is my first time posting here. I've been working on this all day and have made NO progress.
I'm on a Mac OS X 10.9.3 (this was also happening with 10.9.2, I applied the 10.9.3 update today hoping it would make difference).
ANY version of Flash Player I've installed today has worked fine on Safari, and not worked on both Chrome and Firefox. I've uninstalled reinstalled both Firefox and Chrome many times. Both browsers are up to date (Chrome v34, Firefox v29). There are no logs or anything ever.
The plugin runs for a little bit then dies. I've tried reverting to version 12, and version 11, neither made a difference. I've done the whole disable the pepper plugin with Chrome and had Chrome using the other one I had installed. No difference.
I'm OUT of ideas and can't find any other information or help with this. PLEASE HELP!

Your issue is distinct from the original poster's issue about a crash on Mac. I've branched this out to a new thread so that we're not confusing everyone.
Firefox on Win8 isn't very stable. We're collaborating with Mozilla on improvements, and my test results with the daily development builds are really promising, but it will be a few more weeks before they actually make it to production releases.
In the meantime, you're way better off using IE or Chrome.

Flash video performance poor in Firefox 3 and other newer Gecko-based browsers; fails to detect mouse movement in full-s

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