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I have Firefox 18. I have the latest Adobe Flash installed (after doing a full uninstall and reinstall). I have cleared the cache, cookies, etc.

No matter what I try, YouTube videos will not play in Firefox. I always get the same message:

"An error occurred. Please try again later."

If I copy the exact same link into Explorer (which I normally detest using) it plays perfectly. So clearly the fault lies with Firefox.

What can be done to fix this bug?

In Firefox I often wish to toggle between tabs. I need a keyboard shortcut that would transfer to the previously activated tab. This would exactly as Alt+Tab in Windows.

Just this week (10/1/12) I signed out of youtube and now I cannot log back in there or in my gmail account. I have tried every single fix-it/remedy offered on the FF forum but nothing works.

Everything else works, all websites I frequent load fine, is youtube doing something on purpose to FF users? I can get to the youtube page and view videos, but I cannot log in, every time I click the sign in button I get:

"The page isn't redirecting properly

Firefox has detected that the server is redirecting the request for this address in a way that will never complete. 

This problem can sometimes be caused by disabling or refusing to accept cookies."

I hate to be a conspiracy theorist, but I can log in to youtube with no problem on IE, but I hate that browser. I am using windows 7 and FF 15. Can anybody figure this one out?

i want to know how could i restart Firefox in a quicker way than exiting the program and clicking back on the icon. isn't there a shortcut or a button or sth ? plz help

When I try to access me Barclays Online Banking webpage I receive this error message : The connection was reset

The connection to the server was reset while the page was loading.

   The site could be temporarily unavailable or too busy. Try again in a few moments.
   If you are unable to load any pages, check your computer's network connection.
   If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.

If I clear my history I can then access the Barclays login page and re-enter my details but as soon as I log out I receive the error message once again when I go back. I have no problem whatsoever using this website with Internet Explorer.

Please help !!

Some HTML5 videos won't play in my Firefox browser.

This vine for example (https://vine.co/v/b3v5h3Piwt7) only shows up as a static image. I can click the mute/audio button though, but it won't play. When I look at the webconsole when I load the page then 2 javascript warnings show up, the first one say that the Mediasource [long url here] can't be encoded and another one says loading of all candidate sources failed. loading media paused.

I'm using Firefox 21.0 and I tried to run Firefox in safe mode with disabled add-ons, and I also tried to reinstall it, but without success.

Thanks in advance.

TODAY, after updates, I discover the horrible Yahoo search engine has replaced Google. I have a link to Google search engine and I am using it but REALLY????? HOW, in simple english, can I get rid of Yahoo and reinstate Google as my search engine? THANK YOU SO MUCH.

On CNN.com i get this error when trying to view video or when clicking on one of their tabs:

400 Bad Request Request Header Or Cookie Too Large nginx

June 2013: videos on websites start playing without my permission, how to stop this?

What I tried: I uninstalled Adobe Flash (disabling Flash add-on didn't work), existing "stop autoplay" add-ons are no longer working according to reviews, tried solution described in "How can I stop videos on websites from automatically playing?" (Type in the address bar: about:config Then search for: plugins.click_to_play Double click and it will be set to true) - doesn't stop videos from playing either. Sent feedback to FireFox about the issue.

From what I had read in reviews, this is not only about Flash: YouTube disabled add-ons and searches for anything that can play videos installed in Windows, including using HTML5 for this. Have no information how other websites do it.

How to stop this? Thank you.

You Tube and other sites are not playing video on Firefox with Adobe Flash after latest update for both. Adobe Flash is working on other sites but not You tube and those sites that may have embedded You Tube videos, I'm not sure.

Adobe Flash does not crash and no error message is showing. All that shows is a dark screen for the Flash video. Right clicking the screen shows only a non-clickable 'Movie not loaded' and the clickable link to the Adobe home page.

I have spent an hour trying things as suggested for past problems similar to this but none have helped.

I have sent sad face letting you know what I think of the latest update because of this which says pretty much the same thing as I have said here.

I have no further info but if I had some input and queries form you I might be able to provide more.

"Web Companion" has installed itself on my PC and keeps hijacking or changing my browser to Bing.. then keeps offering to fix it.. which it doesn't, sugestions please? Can I remove this programe? I can't find it in the list of programes Please help..,

have a website for a FLVS course that within firefox we always get: a plugin is needed to display this content but are able to see the site fully in Chrome.

How do we find out what plug in to install in firefox to resolve this issue.

This is the message I am getting when I am in a website and click on a link to open.

This XML file does not appear to have any style information associated with it. The document tree is shown below.

<Error>AccessDenied<Message>Access Denied</Message><RequestId>619019A5A84CBA3D</RequestId><HostId>qZuu8SzPCGrkyyLPRJfAgAeIx5BJEq/LYC3g0/SS2rC92vtXgUR4JULvWAM8axbo</HostId></Error>

I have no idea what this means and how to fix it.

had a problem with opening firefox and it suggested that i install a new version, I did and I have an "old firefox data" file. My question is how do I reinstall the old file and all my stuff that is on it .

I work alot on Mozilla and at times, I forget to take backup of Firefox. Chrome has a feature with its Google ID which restores "Everything"

Does Firefox provide any feature anything like this.

YouTube works fine. Other websites play videos, no problem. But then I'll go to a website and see a message that the video is either corrupt or is not supported. When I search for how to play mp4 in Firefox I end up at this site: http://www.jwplayer.com/blog/the-state-of-html5-firefox-now-supports-mp4/ With the huge headline Firefox Now Supports MP4. No, it ****ing doesn't! A bit frustrated, because everywhere I look for help on this, I either come across pages saying it should work, Firefox supports mp4 etc, OR forums where it's webmakers asking the question and then the solution is something wrong in their coding - which doesn't help me, the lonely end user. When I go to this suggested test site: http://techslides.com/demos/sample-videos/small.mp4 I get the error message: Video can't be played because the file is corrupt. No, it's not. I can download it and play it on WinAmp. When I go to this suggested test site: http://www.html5videoplayer.net/html5video/mp4-h-264-video-test/ I get the error: No video with supported format and MIME type found. Huh? Again, I can download and play it fine. But Firefox won't play it. Soooooo Is there a fix in the wind? Is there something I can tweak or change to make Firefox recognize and play this stuff? Is there a plugin/extension/addon that I need to download to play mp4? If this is a known problem that is going to be fixed eventually, is there something I can do as a substitute (ie a plugin for now)? Because it seems like the only alternative is to abandon Firefox and start using Chrome, which has no problem with the above-mentioned videos.