I have a big crossbar mark over my FF4 icon after I've installed and replaced FF3. When I try to open the software, I get "You can't open the application "Firefox" because it is not supported on this architecture." What's up with that?

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

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I've just downloaded 4.0 and now read "You cannot open the application 'Firefox' because it is not supported on this architecture" What do I do?

iMac G5 with PowerPC G5 (3.0). Is this able to support 4.0? Can I go back and run 3.6?

Please consult the Firefox 4 [http://www.mozilla.com/en-US/firefox/system-requirements.html system requirements].
If you cannot use Firefox 4 on your computer, you can download Firefox 3.6 from [http://www.mozilla.com/firefox/all-older.html here] .

I downloaded Firefox 4 onto my PowerPC G4 1.67GHz running Mac OSX 10.5.6. When I try to open it I get error message You cannot open the application "Firefox" because it is not supported on this architecture. I can't find my Firefox 3.6.16 I'm on Safari.

I just want to download Firefox 3.6 again
I downloaded Firefox 4 onto my PowerPC G4, 1.67GHz running Mac OSX 10.5.6. When I try to open it I get error message You cannot open the application “Firefox” because it is not supported on this architecture.

Use Tony's suggestion. I am running it right now and it is awesome. I love Mozilla but they basically screwed all of those older Macs over. Come on Mozilla. These Macs still work, and there are plenty of people with them out there.

I just got a notice to update my firefox to 4.0 and when I downloaded the new software it indicated: that I can't open the application "Firefox" because it is not supported on this architecture. Any ideas about what might be wrong and how to fix it?

I just got a notice to update my firefox to 4.0 and when I downloaded the new software it indicated: that I can't open the application "Firefox" because it is not supported on this architecture. Any ideas about what might be wrong and how to fix it?

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

I am trying to install Firefox 4 on my Mac OS 10.5.8 and I get the error message "You cannot open the application "Firefox" because it is not supported on this architecture" Help!

I am trying to install Firefox 4 on my Mac OS 10.5.8 and I get the error message "You cannot open the application "Firefox" because it is not supported on this architecture" Help!

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

Went to upgrade and says OS too old. I went back to older version of foxfire. Now I have a circle with a line through it and when I try to open it I get,You cannot open the application "Firefox" because it is not supported on this architecture.

I have PowerBook G4, running 10.5.8. Went to upgrade and says OS too old. I went back to older version of foxfire. Now I have a circle with a line through it and when I try to open it I get,You cannot open the application “Firefox” because it is not supported on this architecture. Thanks for the help.

Firefox 3.6.x is the last available from Mozilla for PPC Macs. 
http://www.mozilla.com/en-US/firefox/all-older.html
For older Macs that aren't supported in Firefox 4+ versions, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 . 
http://www.floodgap.com/software/tenfourfox/ 
http://tenfourfox.blogspot.com/ 
https://code.google.com/p/tenfourfox/wiki/PluginsNoLongerSupported

Loaded upgrade and it wont open/You cannot open the application "Firefox" because it is not supported on this architecture.

downloaded your latest upgrade.
Running on mac os 10.5.8
Power PC G5 dual 2 GHz
8 GB DDR SDRAM

I suggest yo change you system requirements: This is what is advertised
Operating Systems
* Mac OS X 10.4 and later
Minimum Hardware
* Macintosh computer with an Intel x86 or PowerPC G3, G4, or G5 processor
* 128 MB RAM (Recommended: 256 MB RAM or greater)
* 200 MB hard drive space
Im running
Model Name: Power Mac G5
Model Identifier: PowerMac7,2
Processor Name: PowerPC 970 (2.2)
Processor Speed: 2 GHz
Number Of CPUs: 2
L2 Cache (per CPU): 512 KB
Memory: 8 GB
Bus Speed: 1 GHz
Boot ROM Version: 5.0.7f0
Serial Number (system): CK347009QEB
Hardware UUID:
SystemVersion 10.5.7 (121)
This is way above your so called system requirements
This has not solved the problem, but now forces me to use Safari

I running OS-10.5.8 and when download Firefox and try to open get "You cannot open the application "Firefox" because it is not supported on this architecture. You cannot open the application "Firefox" because it is not supported on this architecture."

The above is my question

Sorry, Firefox 4+ versions don't support PPC architecture.
For older Macs that aren't supported in Firefox 4 / 5 / 6, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 . 
http://www.floodgap.com/software/tenfourfox/ 
http://code.google.com/p/tenfourfox/downloads/list
Or use Firefox 3.6.20: 
http://www.mozilla.com/en-US/firefox/all-older.html

My Mac with OS 10.5.8 says I cannot open Firefox because it is not supported on this architecture. I tried to update my version, and this is all I get now. What can I do to use Firefox again? Thank you.

My computer is not allowing me to utilize any version of Firefox, after multiple downloading attempts. I simply get a message that Firefox is not supported on this architecture, and the Firefox icon in my toolbar now has a circle on it with a line through it (Canceled). I hope that someone can explain what I need to do to be able to use Firefox once again. Thank you, TC

As you have a PPC or Power Mac the last release form Mozilla to work on PPC is Firefox 3.6.*
Firefox 3.6.23 can be found at http://www.mozilla.com/en-US/firefox/all-older.html
Since you have a PPC Mac there is this third-party option for Firefox 7.0.1 at
http://www.floodgap.com/software/tenfourfox/
As of Firefox 4.0, a '''Intel''' Mac with OSX 10.5+ is required for Firefox builds from Mozilla. http://www.mozilla.org/en-US/firefox/7.0.1/system-requirements/

Cannot open the application "Firefox.app" because it is not supported on this architecture-what does that mean?.

Firefox has always worked fine...until I installed v4. Now I get the above error, and it won't launch. I'm running OSX v10.5.8, and all of my drivers/software are up to date.

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

After upgrade, firefox will not launch says : you cannot open the application "Firefox" because it is not supported on this architecutre how can i get firefox to work again?

unable to launch firefox after I upgraded firefox

I see you are using a PPC Mac with OSX 10.5.8.
Either you can use the last release from Mozilla worked on PPC which is 3.6.*.
The current 3.6.22 is at http://www.mozilla.org/en-US/firefox/all-older.html
Or use a third-party build from http://tenfourfox.blogspot.com/2011/08/601-now-available.html
As of Firefox 4.0 and newer a '''Intel''' Mac and OSX 10.5+ is required.

You cannot open the application "Xcode" because it is not supported on this architecture.

I'm currently trying to understand why XCode 4.3.3 gives me this message when download has completed. I have a MacBook Pro 10.5.8 OS X. Any help would be appreciated WWnewbee

As noted, your OS is not compatible, sorry - see Xcode Versions ~ iOS - As of 9.19.12.

My iMovie no longer will load. Message says, "You can't open the application "iMovie" because it is not supported on this architecture."

I have been using iMovie successfully and have several movies saved, but now iMovie will not load. I have OS 10.5.8 and I don't know what to do. Are there any suggestions? I'm not even familiar with the term "architecture" or why it would be different than it was.

iLife '06 is the newest version that includes iMovie that a G4 will run. Any newer version of iMovie as included with iLife, will not run on a G4.

Firefox can't open the application "because it is not supported on this architecture

"You cannot open the application "Firefox" because it is not supported on this architecture."

Thanks for the link to the system requirements, edmeister. However, my system appears to fit every requirements listed, but still gives the same error message.
Here is what my system profiler tells me about my Imac:
Mac OS X v. 10.5.8
Processor: 2 GHz Intel Core 2 Duo, which Wikipedia tells me is "x86" processor
3 GB 667 MHz DDR2 SDRAM
My Activity Monitor says:
1.87 GB of my system memory free
303 GB of hard disk space free
Is there some explanation why I am being told Firefox 4 is not being supported on this architecture?

YOU CAN'T OPEN THE APPLICATION VIRTUAL DJ LE BECAUSE IT IS NOT SUPPORTED ON THIS ARCHITECTURE .. What can I do to Fix this??

I have a Mac PowerPC G5 and i just installed the Version 10.5.4 to be able to install Virtual DjLE , and after I installed it, i try to open it and there was an error msg saying : " you can't open the application virtual dj le because it is not supported on this architecture"
What can I do to resolve this? ... Can someone help me with this?? ..
Thank you for your help!

Hi, we're out of luck...
MAC SYSTEM REQUIREMENTS
MINIMUM system requirements:
Intel® processor
Mac OS X v10.5.x
1024x768 resolution
CoreAudio compatible soundcard
1024MB RAM
50MB free on the hard drive
RECOMENDED system requirements:
Intel® processor
Mac OS X v10.6.x
1440x900 resolution
Multi-channel CoreAudio compatible soundcard
2048MB (2Gb) RAM
200MB free on the hard drive
Additional requirements for Video mixing:
ATI™ or NVIDIA® video chipset w/256MB of Dedicated DDR3 RAM
Video must support dual-screen output
Supported Operating System and Processor Platforms:
MINIMUM: Mac OS X v10.5 Leapord on Intel processor platform
RECOMMENDED: Mac OS X v10.6.x Snow Leapord on Intel processor platform
Apple® Mac OS X 10.4.x Tiger or older are not supported
Motorola® (PowerBook® G4) processor platform or older are not supported
http://www.virtualdj.com/products/virtualdj/index.html
Might see if the still have version 6.x here...
http://www.virtualdj.com/download/updates.html

I have a big crossbar mark over my FF4 icon after I've installed and replaced FF3. When I try to open the software, I get "You can't open the application "Firefox" because it is not supported on this architecture." What's up with that?

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