Facebook Video says Firefox "is not compatible, therefore no video Chat function.

Upgraded Windows 8 to 8.1. Since then the Video chat function does not appear as a selection when wanting to video with a person. Message says that, "the browser is incompatible". The video function worked fine in version 8. As I remember, Facebook uses the Skype video program. Is there any help for this issue. I am not the only one having this problem.

This sounds to me like Facebook is checking what version of Windows your are running, and does not yet recognize Windows 8.1 as an upgrade to Windows. This is kind of disappointing, first because it hasn't been a secret that Windows 8.1 is coming, and second because filtering by OS like this is kind of a bad practice.
Anyways, this is likely not an issue directly with Firefox. As a work around int he short term, you could cheat and change your user agent to tell Facebook you are on Windows 8 instead of Windows 8.1 with an addon like https://addons.mozilla.org/en-US/firefox/addon/user-agent-overrider/

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At the Google Play Store, it says Firefox is not compatible eith my Samsung Galxy Pro GT-B7510(android). When there will be available? Thanks.

At the Google Play Store, it says Firefox is not compatible eith my Samsung Galxy Pro GT-B7510(android). When there will be available? Thanks.

Probably either never, or not for a very long time. Firefox for mobile requires an ARMv7 processor, your phone has a v6. While the development team is considering supporting ARMv6, it is in the beginning stages, and may not happen, or at least not for a long time.

Firefox won't open on my MacBook Pro (OSX 10.4.11). I think it just did an auto-update, and now after I've restarted, it won't open, and the Firefox web site says Firefox is not compatible with my OS. How do I go back to where it will work again?

What more do you want? This is as much info as there is!

Go here to download Firefox 3.6:
http://www.mozilla.com/en-US/firefox/all-older.html

I am trying to get the CLIPPINGS add on for firefox. but it says it is not compatible with FirFox 8.0 whaat can I do.

I am trying to get the CLIPPINGS add on for firefox. but when I try and download it, it says it is not compatible with FirFox 8.0. also the latest version of firfox is 3.1 but my version is 8.0 Is that right?

There were some issues with the addons site and checking for (compatibility) updates. 
It seems to be working now, so you can try again to install the extension.

I have the old version of Firefox but when I download the update for firefox for the Mac OS X it says it is not compatible with my system which is 10.4.11 on the Mac. Can someone help me.

I need to update my current version of firefox for the Mac and when I do it says it is not compatible for my system but I can't find anywhere that it says what the system requirements are for the new version of firefox for the Mac.

Firefox 4 requires at least OS X 10.5 and an Intel Mac. There is a third party version of Firefox 4 that runs on OS X 10.4/10.5 and PPC Macs, for details see http://www.floodgap.com/software/tenfourfox
If you prefer, you can get the latest version of Firefox 3.6 from http://www.mozilla.com/en-US/firefox/all-older.html
Mozilla are working to prevent Mac users with non-compatible systems from getting the notification about Firefox 4, and also not displaying the "Download Firefox 4" button on http://www.mozilla.com
For the full system requirements see http://www.mozilla.com/en-US/firefox/system-requirements.html

I am not able to install JunkFilter Plus in Incredimail 2.0. Help they say it is not compatible with Firefox 4. Is this correct? Some of my other programs don't work either. Such as HP products.

the programs that don't work with Firefox 4 are:
AVG Toolbar
HP Detect
HP Smart Web Printing
Incredimail 2.0 will not let me install the JunkFilter Plus, and they say it is not compatible with 4.0

This is very serious. Your computer got infected with ransom malware, Cryptowall.
Go here for further info.
CryptoWall 2.0 Anything Good about Buying you Keys? - General Security
CryptoWall and DECRYPT_INSTRUCTION Ransomware Information Guide and FAQ

As soon as I downloaded Firefox 4, my Roboform no longer worked. Roboform says it's not compatible so I need to buy an update from them. How can I download Firefox 3 again?

As soon as I downloaded Firefox 4, my Roboform no longer worked. Roboform says it's not compatible so they want me to buy an update from them...don't want to do that. How can I download Firefox 3 again?

What you are seeing sounds like the "advertised update" from Firefox 3.6 versions to Firefox 8.0.1 that started on 2011-12-01. See --> https://wiki.mozilla.org/Releases/Firefox_3.6_MU
This is the same as has occurred when prior versions were nearing their end-of-life. Support for Firefox 3.6 versions is likely to end in the first quarter of 2012.
There are changes in the interface from Firefox 3.6 to Firefox 4 and newer versions. See --> https://support.mozilla.com/en-US/kb/common-questions-after-updating-firefox
The new Firefox version can be made to closely resemble the 3.6 Firefox interface.
#See --> http://www.computertechtips.net/64/make-firefox-4-look-like-ff-3-6/
#See --> http://blog.fligtar.com/2011/01/16/how-to-customize-firefox-4s-ui/
#See --> '''''Firefox 3 Theme for Firefox 4''''': https://addons.mozilla.org/en-US/firefox/addon/firefox-3-theme-for-firefox/
#*Add color home, back/forward and other buttons (like Firefox 3) to the Navigation Toolbar in place of the gray buttons in Firefox 4
#*See: http://ffaddons.game-point.net/ff3ff4/
#Also see --> http://support.mozilla.com/en-US/kb/How+to+customize+the+toolbar
The only currently supported versions are 3.6.24 and 8.0.1. Firefox 9.0 will be released on or about 2011-12-20 and will completely replace Firefox 8.0.1; an update to Firefox 3.6.25 from Firefox 3.6.24 will likely occur around that same time to correct any new security/stability issues found in Firefox 3.6.24.
'''If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.'''

Want to be able to open tabs in multiple rows, rather than in a single row. I used tab mix plus before, but it says it is not compatible with New tab Homepage. The older version of Firefox allowed this very easily.

Want to be able to open tabs in multiple rows, rather than in a single row. I used tab mix plus before, but it says it is not compatible with New tab Homepage. The older version of Firefox allowed this very easily.

Your plugins list shows outdated plugin(s) with known security and stability risks.
*Java Plug-in 1.5.0_06 for Netscape Navigator (DLL Helper)
Update the [[Java]] plugin to the latest version.
*http://java.sun.com/javase/downloads/index.jsp (Java Platform: Download JRE)

I have Webroot Security and Firefox is not compatible with the malicious URLs part of the program? How do I protect myself?

When I downloaded Firefox and was checking my extensions, I was advised that Firefox is not compatible with the malware prevention part of my Webroot security package. I use it successfully with Windows and just renewed for another year. What do you suggest I do to protect myself? I am not a computer expert so if you could reply in plain language it would be appreciated. Also, we stream videos a lot and I noticed that DivX is also not compatible. What do I do about that? Thank you.

I was having this issue for Firefox version 7 and had to spend one hour trying to find a solution. Here is the solution. Go to webroot.com, tab to support and than 2011 product support. Type in Firefox Toolbar it will than say are you unable to use firefox toolbar hit yes. It will say under 1. click hear to download patch. Save the file and after the download run it. After installed close firefox and you should have the webroot toolbar running again.
ff7fix.exe is the file you need.

How do I access "Firefox is NOT compatible with this application. For best performance, please use Internet Explorer 5.0 and above...." web sites; when I try to download any alternate browser, then a warning that alternate is "imcompatable with your opera

How do I access websites that warn: "Firefox is NOT compatible with this application. For best performance, please use Internet Explorer 5.0 and above...."? When I try to download any alternate browser, all I get is another warning that the alternate is "not compatible with your operating system." Is Firefox preventing this? The site listed below is a job application site. I've had this same problem with other job application sites also.
== URL of affected sites ==
https://storefront.kenexa.com/lithia/cc/Home.ss

There should be a User Agent Switcher menu item under Tools, which gives you the browser names you can impersonate.
The menu item name changes to the browser UA you are presently using.
There is also a User Agent Switcher button, you can add it using View -> Toolbars -> Customize, and dragging the button to your toolbar.
See http://chrispederick.com/work/user-agent-switcher/features/ and http://chrispederick.com/work/user-agent-switcher/help/
You can just start trying IE versions (or the versions it says on the site) until it lets you in.

TS1538 I have followed the steps to locate usbaapl.inf. but Windows vista says this is not compatible with my device. What do i do now?

Trying to manually install USB driver for Ipad2 in windows vista 32 bit. I have followed the steps to locate usbaapl.inf. but Windows vista says this is not compatible with my device. What do i do now?

If you encounter problems with Google play at downloading Firefox for Android try to download these builds: http://www.mozilla.org/en-US/firefox/channel/#firefox .
Please remember that you should enable for this the settings: allow installing app from other sources that Google Play

Web site say it's not compatible with safari

I am trying to complete a registration within a web site . I cannot sign in because it says it is not compatible with Safari. Is there anything I can do?
Tks
E

The one for Mac.
Firefox Version 17.0.1 for Mac OS X English (US)
or
Click the link I posted in my reply.
Double click to open it
Click the Finder icon in the Dock. Open Application folder.
Drag it to the Application folder.

Firefox 5 not compatible with windows 7 apparently!! Need to downgrade to previous version. Computer crashes using ff but nothing else.

Microsoft's site says firefox 3 is compatible with windows 7. however, i've upgraded to firefox 5 and now system crashes to the blue screen.

I have a laptop running Firefox 5.0 on Windows 7 and don't have problem with it.
What I suggest you do in the first instance is to start Windows 7 using the '''Last Known Good Configuration''' which will load the operating system the last time it worked properly, instructions here: http://windows.microsoft.com/en-US/windows-vista/Using-Last-Known-Good-Configuration
Then do the following. 
#Use Internet Explorer to download Firefox from here: [http://www.mozilla.com/en-US/firefox/fx/?ref=logo Download Firefox 5.0.1] and choose "'''Save'''" when you see the prompt and save it to your desktop. ''Do not choose "Run"''. 
#Next, uninstall the version you have at the moment via "Programs and Features" in Control Panel choosing to keep your bookmarks, customizations etc., (''don't checkmark the box''). 
#Next, reboot. 
#When the system boots to the desktop, delete the folder called "Mozilla Firefox" at this location: C:\Program Files\ 
#Run the installation file you downloaded earlier. 
Your bookmarks, customizations etc., are maintained in a different location and will become available to you again once you complete the installation. 
I don't know if your bookmarks can be retrieved or not, but the following procedure can be used to make a backup should they still be available. 
#Press CTRL+SHIFT+B to open the Bookmarks manager. 
#Click the link to '''Import and Backup '''and then click '''Export HTML '''and save the file somewhere.
You can use the same Bookmarks Manager to import the file you saved by choosing "Import HTML" should that prove to be necessary.

I keep getting auto prompts to upgrade to 14.5 however it then says it is not compatible with my Kapersky anti-virus. Do I upgrade?

FF14.5 says it's not compatible with the Kaersky virtual keyboard and the URL adviser. I think the URL adviser is part of the anti virus. I have chose to stay with 12.0 because of these notices?
thanks.

There is no Firefox 14.5, I'm assuming you mean Firefox 14.0.1?
As to your question, you should always update your Firefox, as it fixes security holes that can leave you and your data at risk. As to the Kapersky, you should be able to update firefox, then update Kapersky and your Kapersky add-ons will work. I should mention though that the Kapersky add-ons are not part of your actual anti-virus protection, and do little to nothing to protect you. Even if they are disabled your anti-virus application still runs just fine and you are still protected from threats. You should update to Firefox 14.0.1 (and subsequent releases) as soon as possible.

Can't add addon of Autofill, says it's not compatible

I just downloaded newest version of Mozilla and trying to use Add-0n of Auto Fill Form and it won't download....says it's not compatible with this version.

4.0 needs 10.5 and an Intel processor. 
http://www.mozilla.com/en-US/firefox/4.0/system-requirements/
For older Macs that aren't supported in Firefox 4.0, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 . 
http://www.floodgap.com/software/tenfourfox/

Facebook Video says Firefox "is not compatible, therefore no video Chat function.

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