how to install "old firefox data" to firefox nightly?
My Firefox Nightly was working good yesterday, but today I pressed the icon it gave me some reinstall tab, I had to reinstall because I couldn't open Firefox. After reinstall on my desktop was created "old Firefox data" folder and everything that was yesterday in my Firefox Nightly gone, so I want to put that "old Firefox data" again, but I don't know how and where...
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See this KB article - https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile#w_copying-files-between-profile-folders
Treat that "old Firefox data" folder as the old Profile.
These can't get your data back, but will help in the future.
These add-ons can be a great help by backing up and restoring Firefox
FEBE (Firefox Environment Backup Extension) {web link} FEBE allows you to quickly and easily backup your Firefox extensions, history, passwords, and more. In fact, it goes beyond just backing up -- It will actually rebuild your saved files individually into installable .xpi files. It will also make backup of files that you choose.
OPIE {web link} Import/Export extension preferences