http://portableapps.com/apps/internet/firefox_portable Mozilla Firefox, Portable Edition

https://portableapps.com/apps/internet/firefox-portable-esr Mozilla Firefox ESR, Portable Edition

A fully functional package of Firefox optimized for use on a USB key drive. A specialized launcher will allow most favorite extensions to work as you switch computers.

Firefox Portable is a 3rd-party build. Support is available here: http://portableapps.com/forums/support/firefox_portable

You can use sync to share data between profiles. But some data cannot be shared between different versions.

Thanks for the reply, best regards :)

Glad to help. Safe Surfing.

why the portable version cannot be refreshed? it makes the updates, it behaves normally, etc, except for the refreshing. I frequently get an invitation for refresh due to slow startup but in the refresh page the link is dead for portable version. why?

refresh used to work perfectly with the normal version!

even the safe mode is not helpful i.e. refresh not working in that mode either. thus it is not an issue of the add-ons.

Firefox Portable is a 3rd-party build. Support is available here: http://portableapps.com/forums/support/firefox_portable