Are you on ARM?

from https://www.mozilla.org/firefox/136.0/releasenotes/

On Linux, Firefox is now available on ARM64 (AArch64), with installation options via APT and tarballs. Flatpak support is coming soon

https://www.mozilla.org/firefox/all/desktop-release/linux64-aarch64/ https://archive.mozilla.org/pub/firefox/releases/136.0/linux-aarch64/

recent d/l of firefox-136.0.tar.xz for linux-x86_64. It crashed immediately with err 126. The ff.exe and ff.bin files were for ARM arch. This wasn't easy to locate and I think it was caught but anyone still headscratching may want to see if this is an issue

Wait so you do not have Linux on a ARM CPU? as you downloaded from the /linux-aarch64/ folder instead of the /linux-x86_64/ folder?

You can get 64-bit Linux Firefox from either https://www.mozilla.org/firefox/all/desktop-release/linux64/ or from linux-x86_64 folder https://archive.mozilla.org/pub/firefox/releases/136.0/linux-x86_64/

I linked to archive.mozilla.org as Mozilla prefers people use that as the old ftp.mozilla.org was from back when the ftp:// protocol was still in use before August 5th, 2015.

No, I'm not on ARM and don't see it showing up at https://ftp.mozilla.org/pub/firefox/releases/136.0/. I THINK I see some extra choices - ARCH is new to me as is i686. At at my age I could have hit the wrong one but I've gone to x86_64 so often I sleep walk through it (I have adopted 2 kittens and C&C may been involved). But there have been other issues I've had lately so was looking elsewhere. Awhile ago I was using release ver 135.0.0 and waiting for 136. It took so long to come up I got antsy and jumped on a late beta to see what I may be missing. That took me down the rabbit hole of forcing me to learn the --allow-downgrade switch at start to get back to the release channel, which was at 135.0.1, from the beta channel. Here is where an issue came up with my title bar, which is gone (no, customizing is broken here). While searching around google, I kept on running into this chromium feature with tabs on top and folks getting really antsy about the title bar and the likes/dislikes for it and the sidebar thing (which I don't use and never cared for and thats on the side, not the top) - you all may have read my prior post on this which I posted on someone else's thread and landed with a thud. James, thank you for that link - I was unaware of the FTP change, 10 years of patience on mozilla's part is commendable. I only posted this for anyone who may have had a problem - in looking into this I think I see where it was fixed since I had 2 different binary files, 1 on desktop and 1 on laptop, the result of having 2 tars. Normally I d/l to usb and use among 3 machines. This time, I went to the FTP site twice for whatever reason and "hit a jackpot", so to speak.

No, I'm not on ARM and don't see it showing up at https://ftp.mozilla.org/pub/firefox/releases/136.0/. I THINK I see some extra choices - ARCH is new to me as is i686.

The first folder is for ARM, second is for 32-bit Linux and third is for 64-bit Linux.

linux-aarch64/ linux-i686/ linux-x86_64/

It is new for Releases as I posted the Firefox 136.0 release notes link about it.

That was noted in the Whats New. I don't read them all too close - my bad. I assumed aarch was just arch linux and didn't think about it any more - I wasn't looking for ARM, I've never seen it - guess I'm provincial. Thanks for pointing that out.