Firefox Portable

I'm running a browser extension (or should I say "add on"?) which requires the presence of a so called "companion app".
In a non-portable environment such an app has to be installed in the main OS, as well as the browser itself.

I'm wondering whether there is a way to "install" such an app inside the FF Portable's folder, in order to carry it around together with the browser, in a USB key or similar device.

PS. I searched, before posting, for similar questions but did not find any.

How can one update from the ESR (52) Firefox to the newest (57) one?

How can one exclude Firefox from updating? So when three is an update PortableApps shall not install it.

hello,
I want to set LocalHomepage in FirefoxPortable.ini (same directory as FirefoxPortable.exe).So,i set the line LocalHomepage=http://www.google.com; il does not work.
is there anything else to do ?

Hello. I don't want to update my main Firefox installation yet because several add-ons I use are legacy without replacements. But I'd like to segue to FF 57 and instead of creating a new Portable Apps directory it would be nice to use a 2nd profile installation in my regular PA directory for the transition. I know I can use the beta but betas are betas.

Have a nice day!

Is it ipossible to launch the "Desktop Firefox" and Portable Firefox (52.2.0) in the same time?
If I start "Desktop Firefox" then I start Portable Firefox I get an error message pop up:
"Another instance of Firefox is already running. Please close other instances of Firefox before launching Mozilla Firefox, Portable Edition"
Is there a solution?

I have Firefox v57.0 "installed" as a portable app. In the "App" folder there is a "Firefox" folder and a "Firefox64" folder. I only ever use the 64-bit version so is it possible to completely delete the "Firefox" folder? It's kind of strange in a way. The "Firefox" folder contains 113 files. The "Firefox64" folder contains 112 files. What is the extra file in the "Firefox" folder?

Using Firefox 57 with syncing via Dropbox. After the browser restarting even on the same device its customization settings are reset to defaults and the Firefox Account Sync is logged off (so re-login is needed after each restart). How to resolve this issue? Thanks!

https://www.mozilla.org/en-US/firefox/