Phyrox ESR portable app made with Lightdesk. Run Mozilla Firefox ESR as a portable app.
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Download and install the latest portable setup where you want then run phyrox-esr-portable.exe.
If you have already installed Firefox ESR from the original setup, move the following files :

%APPDATA%\Mozilla\Firefox\Profiles\*.default\* to data\profile\default

Then run phyrox-esr-portable.exe and remove Firefox ESR from your computer.
Upgrade
For an upgrade, simply download and install the latest portable setup.   

 Following a trademark violation report from Mozilla, Firefox ESR portable has been named Phyrox ESR portable on Portapps. Nothing changes except its name.

 Standard and Developer Edition are also available

Modifications
Some modifications have been made through policies to ensure portability:

Multilingual : All languages are included in app\langs and can be enabled in config file (see below).
Disable updater : Firefox ESR updates are turned off.
Don’t check default browser : Stops Firefox ESR from checking if it is the default browser at startup.
‘Know your rights’: Don’t show on first run.
WhatsNew: Don’t show WhatsNew on first run after every update.
Profile: Profile path is overrided to data\profile folder (see below).
A shortcut is created at launch to allow native notifications and removed when Firefox