I recently tried to back up my FF portable profile and found it located on the C:/ ... apps/data/roaming... folder on the last machine that I used. This was found using the about:profiles function.
Is Firefox now designed like Chrome where you can't back up a full profile without it creating a fresh blank profile?
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It's located within FirefoxPortable\Data\profile. The about:profiles page does not show your current profile when Firefox is launched with the -profile switch. It only show's locally 'installed' profiles.
Sometimes, the impossible can become possible, if you're awesome!
So it's different from the locally installed Firefox where you would see that actual profile.
If I want to portableapps profile then the FirefoxPortable\Data\profile folder would be the the to back up and copy after I closed the portable browser, yes?
That is the correct location. You should backup the whole Data directory so Firefox Portable also knows what the last path is so it can adjust if you ever restore a profile.
Sometimes, the impossible can become possible, if you're awesome!