Firefox portable is not truly independent. It cannot be run at the same time as the non-portable version. Trying to do that gives this error message: "Another instance of Firefox is already running. Please close other instances of Firefox before launching Mozilla Firefox, Portable Edition."
New: Kanri (Oct 9, '24), Platform 29.5.3 (Jun 27, '24)
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I think it prevents cross contamination of Firefox files, by the other instance, but
it can be turned off within the ini file. I don't know where it's located (the ini file), maybe some else can tell you, but it's a design feature, not a flaw and doesn't affect Firefoxes ability to be portable.
Why would you need to do this? Esp.considering that any one running instance can have multiple tabs and multiple windows open at the same time.
I made this half-pony, half-monkey monster to please you.
You have an installed Firefox on your work machine that you use for business purposes, and, also would like to use FFP with all your personal settings, addons, bookmarks, passwords etc.
It would be nice if you could have both sets open at once, but it is a limitation of the upstream that this simply refuses to work.
Even if you download a completely independent version, such as IceWeasel, it will still refuse to run at the same time as Firfox.
So, yes, it would be great to have, but it ain't gonna happen, until the Moz devteam redo big parts of the core.