How to import all my settings, plugins, bookmarks including container settings to a new profile?

You can delete the compatibility.ini file in the profile folder if you copied/restored this file from the other computer. ----- Bookmarks shouldn't be that difficult because Firefox keeps backups of the bookmarks in the backups in the bookmarkbackups folder. Restoring extension data might be more difficult because this data in stored in indexedDB (local storage) using a special UUID that is stored in prefs.js (extensions.webextensions.uuids). *bookmarks and history: places.sqlite *bookmark backups: compressed .jsonlz4 JSON backups in the bookmarkbackups folder *cookies.sqlite for the Cookies *formhistory.sqlite for saved autocomplete Form Data *logins.json (passwords) and key4.db (58+) or key3.db (57 and older) (decryption key) for Passwords saved in the Password Manager<br>if you only have key3.db then make sure to remove an existing key4.db *cert9.db (58+) or cert8.db (57 and older) for (intermediate) certificates stored in the Certificate Manager<br>if you only have cert8.db then make sure to remove an existing cert9.db *persdict.dat for words you added to the spelling checker dictionary *permissions.sqlite for Permissions and possibly content-prefs.sqlite for other website specific data (Site Preferences) *sessionstore.jsonlz4 for open tabs and pinned tabs (see also the sessionstore-backups folder)