Firefox Support Forum

Client said that video cannot load on firefox except other browsers. It shows "Video format or MIME type is not supported". Firefox version is 33.0.3. Video is mp4 format.

every time i open fire fox, a random tab opens roughly every twenty seconds, each day on a different site. yesterday was some games site, today was this: https://www.lotterymaster.com/free-lottery/11?offer_id=102&aff_id=54&SourceId=355&CreativeId=18377777&LineItemId=5729187&PublisherId=738709&SectionId=13947420&aff_sub=000074083021da0534d448ed7724a4b4b9c16&incentive_code=6b20c5b52be7e238414afc9baf80eeb7

(sorry for long link) i have tried disabling some of my add-ons to no avail. i have scanned my computer with Avast! and malware bytes. i haven't been on any dodgy sites when it happens. i have just realised, but i think it might be every time i click a link, a new page with an ad will open. it only happens on any link once.

any ideas?

I have dealt with this for years. I have "reset" Firefox numerous times, I have uninstalled Adobe Flash and reinstalled version 16.0.0.235. After I uninstalled and updated it ran for a while but I am back to the "Flash is busy" message. The only way I can go on is to stop the plug in, or disable it, but of course then I have no video. I installed "Videowithoutflash" (I think that was the name of it listed with Firefox extension and highly reviewed, and it all ran fine for about a day. But then the next day no videos would play unless I enabled flash, and then it soon starts crashing again. This is a problem for years now. I have been through many forums trying to find an answer, nothing works, or if it does not for long. Is there not some way to get rid of Adobe Flash and play videos? Are there any browsers that don't use flash for viewing videos? Help! Thanks in advance Bill

Cannot communicate with peer no common encryption algerithimth(s) Spelling maybe incorrect! error code ssl_error_no_cypher_overlap authenticity of received data could not be found

I don't do technical and this is all foreign to me , no idea. Just trying to do the National Lottery which I have done before, all else seems ok. Will not let me into this site

Help needed please

Today when accessing gmail, gmap and google related sites, I suddenly got error (this never happened before), Secure Connection Failed An error occurred during a connection to mail.google.com. SSL received a record that exceeded the maximum permissible length. (Error code: ssl_error_rx_record_too_long)

This happens only when accessing google from Firefox. With other browsers, no such problem occurs. So this is a site and browser specific problem. I tried everything I know to fix this problem, including clear cache & cookie, remove cer8 database file, reset Firefox, change to no proxy, etc. But all failed. I need help on this. What's hell going on?

Anything I print that is not from the Internet or email is fine. Any and all saved documents etc print as they always have. But suddenly anything from the Internet or any emails that I print are so small I can hardly read them.

EVERY time I try to access my e-mail through Firefox I instantly get this message: "Your session has expired. Please log in again". My provider is Time/Warner, and my internet access is working fine. Firefox is also working well except for this e-mail issue; I can access my stored bookmarks, etc., no problem. I can even access my Time Warner e-mail through another browser (Safari), so I know there is currently nothing wrong with the Time/Warner site's built-in e-mail engine. I have already tried reinstalling Firefox, including several different versions, to no avail. I've also tried "resetting" per your troubleshooting instructions, and restarting in Safe Mode. No success. This issue began suddenly a couple days ago—no warning. To my knowledge I have received no viruses or malware in recent months. Tech Support at Time/Warner tells me other customers are having this same problem lately. Suggestions? Thanks, Jeff

Basically whenever I open a new tab 'Delta ALWAYS comes up' as the default search! :(

I have reset Firefox. I have reset to blank and to Mozilla as default. I don't understand your instructions about malware (but is it???) resetting and too nervous in messing up my laptop to try ! :(

I now detest Delta Search and want it totally removed forever.

Nothing gets rid of it.

Only started about a month ago-ish. I run Win 7 Professional. Intel 3rd Gen Intel Core i7-3740QM Processor 32 mg ram Nvidia Quadro K3000M video card

After I uninstalled Firefox, all icons returned to usual PDF icons and files were identified as "PDF" files, but when I installed Firefox (31.0) again, all PDF files again are identified as "Firefox HTML document". Extensions do not change, they are always .pdf, and files automatically open in Adobe Acrobat, but icons became "firefox HTML documents" icons and it is very confusing.

Firefox is using about 80% of my memory. -I have the latest version of Firefox -No Extensions are Installed.

When opened the same websites on chrome and Firefox, it shows Firefox is using more memory, infact my total.

Websites opened: https://www.gmail.com https://adwords.google.com https://www.wordpress.org https://kretyanews.com https://www.reddit.com/ http://www.cricbuzz.com and https://support.mozilla.org

These are the websites opened on chrome and firefox at same time. moreover , i tried 11 tabs on chrome. but it is using much less memory than firefox. Please see the screenshot

We had a power outage and when my computer came back on it just opened up a blank session. Restore previous session was not offered as an option - it was greyed out. I (probably stupidly) tried closing and reopening. I've now read a lot of ways to restore them, but many of them I don't really understand. I've found the profile folder, and made a copy of the sessionstore files. Instructions say to right click and press properties and then select "previous versions". This is where I come unstuck. I don't seem to have that as an option. There are tabs "general", "script" "security" and "details" all with multiple sub-options. I can't seem to find anything that says previous versions. I even followed one instruction that said to do this on the folder rather than the file, but there was no option titled "previous versions" on that either. I'm (unfortunately) using windows 8.

Whenever I open Firefox, there are two firefox.exe running the background whenever I open the browser. Whenever I try to close the second one, it crashes all of the tabs that are on the browser, and whenever I reload the tabs, it pops up again.

I've scanned my computer multiple times with multiple anti-viruses, but there was no viruses to be found. I've also disabled the plugins that I thought were the issue, and refreshed Firefox, but it was still there. I restarted my computer, no luck in doing that. Uninstalling and reinstalling Firefox didn't even do the trick either.

The double processes sky-rockets my RAM and CPU, and it's starting to get annoying. Please help! I appreciate any cooperation!

Periodically when Firefox is updated, it starts rejecting Yahoo Mail from loading, giving the "Your connection is not secure" / SEC_ERROR_UNKNOWN_ISSUER error. Unfortunately, it does not give you the option to add an exception, which clears up the problem most of the time.

Today this happened again with no ability to add an exception, and after looking at various websites for hours, trying to find a fix, I stumbled on one: Having Firefox "...automatically search for and import CAs that have been added to the Windows certificate store by a user or administrator." These are root certificates which you've manually imported. If you understood that last sentence, then it means you've probably done it on your computer; I know I have. The steps to fix it are these, and I cite the original web page further below:

- Open a new window in Firefox and type "about:config" without the quotes and hit enter - Confirm that you want to continue - In the search field, type in security.enterprise_roots.enabled and hit enter - you'll be left with one field - If it's marked as "false" then double-clicking it should turn it to "true" - Close the window, then go back to your Yahoo email login and try again. For me, this worked *perfectly*!

Here's the site where I found the info, under the "Experimental Built-in Windows Support" section: https://wiki.mozilla.org/CA:AddRootToFirefox

Good luck - I hope this helps to fix your Yahoo email login problem, too!

Why has the function of my up & down arrow keys changed? Did I click something by accident? Help please?

(My new kitten *might* have stood on something on my keyboard - she's done that before & put Full Screen mode on, but I managed to fix that)

Normally, I scroll down a web page a bit at a time using the down arrow key on my laptop keyboard. Since yesterday, when I press the down arrow, the page jumps to the bottom (like pressing PageDown would do) and the up arrow jumps all the way back up.

How do I set it back so that it scrolls a bit whilst I press the key?

Randomly when I turn on firefox, go to a new page or open a new tab I will either get a full blown pop up (Almost all of them are awful but one was actually a full TV episode which threw me for a loop. And it was to a show I actually like) or I will get a little tiny add or video in the bottom right hand corner. Most of the time, though HIGHLY annoying, I can just close it down. But when it pops up when I'm trying to watch something on Netflix I have to refresh the page in order for it to go away. I have popup-blocker on but I'm still getting popup and little ads like crazy. I've run virus and malware scans. But it doesn't find anything. I don't want to reinstall firefox if possible because I don't want to have to copy my 50 bookmarks....anything else I can do? Help?

first i would like to say how cool firefox is and i have been sing chrome for so long but i neverlook back at it again. im using windows 10 microsoft edge updated to mozilla firefox. all the video streaming like youtube etc but i dont know why twitch tv is not playing on firefox, i have been researching the web for solution but i dont know whats wrong please help me fix twitch tv and plsy the video stream using firefox.

thank you in advanced looking forward to your positive response.

Every few days when i try to use Youtube or Google in Firefox i get the Error Message "Secure Connection Failed" and the Code "PR_END_OF_FILE_ERROR". This is very annoying and i did not find a way to fix this for me. The only workaround is using another browser. I have the Version 68.0.2

Suddenly, I was unable to access Hotmail or another email account that uses Outlook. The message I received was: "JavaScript required to sign in. This web browser either does not support JavaScript, or scripts are being blocked."

1. Why would this spontaneously happen?

2. How do I fix it?

The problem is that the homepage of "YouTube" is completely blank like so: https://i.imgur.com/M8f7Yn6.png . The browser I use by default is Firefox and it happens both in incognito mode and normal browsing mode. If I use microsoft edge, Youtube loads fine, If i take a youtube video url from edge to firefox; the video will load up but nothing else: http://i.imgur.com/iOusiyA.png