from my existing pff into the new one to keep things like extensions, bookmarks etc.
(I guess this would appy for each occasion where the new version isn't "upgraded" but is a new install)
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There's a link to this question right on the Firefox Portable homepage and the support page.
Copying your local Firefox settings to Firefox Portable:
https://portableapps.com/support/firefox_portable#local_profile
Upgrading Firefox Portable:
https://portableapps.com/support/firefox_portable#upgrading
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