It's not a question but an issue to do it because I need it and I wasn't able to found how to do. Perhaps it would be helpfull for someone else.
To change the Firefox Portable icon, you need a .ICO file, rename it into main-window.ico then put it into the path \FirefoxPortable\App\firefox\chrome\icons\default if they not exist, create all missed folders.
That's all 
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I spent the better part of two hours trying to figure out how to do this on my own. I looked up programs to manually change the icons, but most cost money, which I wasn't willing to spend. The freeware screwed up the EXE file to make it unusable, and up until two minutes ago I was pulling my hair out trying to figure this out. Then it occurred to me that I should do a google search about the particular program I wanted to change, which led me here. Thank you so much!
Neat trick, and thank you for the information. It makes me wonder how to change the Firefox icon that shows up in the PAc menu (so they match)? I guessing my answer resides in \PortableApps\FirefoxPortable\App\AppInfo. Suggestions? I don't want to break anything.
But you need to recompile the launcher (possibly with NSIS Edit (portable) https://portableapps.com/node/13990) with the script from the FirefoxPortable\Other\Source\FireFoxPortable.nsi after you do this.
It's just FirefoxPortable\App\appicon.ico on the 1.5.x version and FirefoxPortable\App\appicon_16.png in the 2.0 beta of the platform and moving forward.
Sometimes, the impossible can become possible, if you're awesome!
Thank you for the clarification, I am fascinated by all of this and learning as I go...
Hello
I would like to know how to change the taskbar icon in Firefox 6 Portable. I know that you explained how to do it with Firefox 2 but the technique you used (Replacing the "main-window.ico" icon) no longer works with Firefox 6 Portable.
Thank you for your help Guys, I'm eagerly waiting for your answers.
You need to change appicon.ico in App\AppInfo Folder and then download NSIS Portable: https://portableapps.com/apps/development/nsis_portable
Use NSIS to build a new Launcher(Open NSIS -> Compile -> select FirefoxPortable.nsi) with the icon you chose.
That won't change the window icon though.
you can change it with restorator 2007 trial version.
open \App\Firefox\firefox.exe and replace both icons. make sure you did a backup first.
recache your icons in windows (log out and in again) and it should work.
don't know why the icons are smaller than expected any help is appreciated.
tbr
Thx
I tried method with FirefoxPortable\App\firefox\chrome\icons\default and main-window.ico
but it doesn't work in portable firefox ver.27 that I am using,
is there any other way to change taskbar icon?
It was changed in Firefox. It's now: FirefoxPortable\App\Firefox\browser\chrome\icons\default\main-window.ico
Sometimes, the impossible can become possible, if you're awesome!
It worked now, thanks