Certain websites don't play - add-ons or plug-ins interfere

I've been having strange problems for a couple of weeks. In general, my computer works okay, but certain websites don't manage to play videos or audio while others do. I tried disabling the av firewall to see if that was blocking anything, but it wasn't the cause. Both Flash Player and Java are fully installed, including the Firefox plug-ins and add-ons that are recommended for them, i.e., Shockwave player or Java updates. (Must I keep the old add-ons for Java if they are updated or should I disable them or delete them somehow?) Someone told me it could be my javascript, but that is checked off properly in options.
My CA av program found a "possible" Trojan over a month ago and located it in a particular java file, so I ended up deleting that file and reloading java. When I would go to java.com, it said I was full operational. Then I downloaded a couponprinter and kept getting told that I needed to load java. I reloaded it twice, but kept getting the same message. Yesterday, I woke up to find a message that Firefox recommended disabling a java plug-in because it makes the computer unstable. Only when I finally uninstalled java completely and reinstalled it, did it begin working fully and I no longer get that Firefox message even though the plug-in is installed. Coupons now print fine and my flash player seems to be operating, but one particular websites just doesn't display the audio player (it's a college radio station). I also developed a problem yesterday trying to open up a web pdf which I never had problems with before, but resolved it when I disabled the Adobe Firefox plug-in. Why would Firefox recommend a plug-in if it only hinders the use of websites?
Also, when I first followed Firefox's suggestions, I opened up Firefox in Safe Mode. When I returned to regular Firefox, the colors of the taskbars had changed - they're all pale grey - and I don't know why or how to change them to the warmer version I used to have. The tint did not come as a result of an installed theme or personality, but it's gone.
Anyway, I'm just confused because add-ons and plug-ins are added and then create new problems, when I thought they are supposed to resolve problems. Can you help me figure out how to get the player on the websites to open?

same problem here for the past two days till this morning when I created a new profile and removed ALL addons from the default profile. With the new profile with NO addons, I got to the sites with video that I had problem with and flash player did work.
Now, I only have three addons that have not created the problem; adblock, flashgot, and flashblock.
Create a new profile and check it out.

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Videos will no longer play and add-ons and plug-ins say up to date?

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Please try two things, please clear the storage for the flash plug in by right clicking where the video should be and clicking "Global settings" and navigate to storage. Clear the stored data and restart Firefox.
Some problems with Flash video playback can be resolved by disabling hardware acceleration in your Flash Player settings. (See [[Flash Plugin - Keep it up to date and troubleshoot problems|this article]] for more information on using the Flash plugin in Firefox).
To disable hardware acceleration in Flash Player:
#Go to this [http://helpx.adobe.com/flash-player/kb/video-playback-issues.html#main_Solve_video_playback_issues Adobe Flash Player Help page].
#Right-click on the Flash Player logo on that page.
#Click on '''Settings''' in the context menu. The Adobe Flash Player Settings screen will open.
# Click on the icon at the bottom-left of the Adobe Flash Player Settings window to open the Display panel. [[Image:fpSettings1.PNG]] 
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# Click '''Close''' to close the Adobe Flash Player Settings Window.
# Restart Firefox.
This [http://www.macromedia.com/support/documentation/en/flashplayer/help/help01.html Flash Player Help - Display Settings page] has more information on Flash Player hardware acceleration, if you're interested.
Does this solve the problem? Let us know.

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Hi and welcome to the Apple discussion forum!
Yes Safari do use plugins as well as firefox, i guess that you already got the Flash plugin installed.
But you find some other available plugins at this site as well, that you maybe not have installed yet.
http://www.apple.com/safari/download/plugins.html <<
And regarding the Appstore that has really nothing to do with Safari though, the appstore is a
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Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe Mode start window.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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same problem here for the past two days till this morning when I created a new profile and removed ALL addons from the default profile. With the new profile with NO addons, I got to the sites with video that I had problem with and flash player did work.
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Create a new profile and check it out.

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James j,
You have a different problem. Your screenshot shows "The Adobe Flash plugin has crashed".
See [[Plugin crash reports]] and [[The adobe Flash plugin has crashed]]. If you need more help you should [[ask a question|ask a new question]] (start a new thread).

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same problem here for the past two days till this morning when I created a new profile and removed ALL addons from the default profile. With the new profile with NO addons, I got to the sites with video that I had problem with and flash player did work.
Now, I only have three addons that have not created the problem; adblock, flashgot, and flashblock.
Create a new profile and check it out.

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Certain websites don't play - add-ons or plug-ins interfere

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