Text: "The procedure entry point hb_ot_layout_table_get_script_tags could not be located in the dynamic link library C:\Program Files\Firefox Nightly\xul.dll."

And when I click "OK" button, the next error is: "Couldn't load XPCOM".

Was this fixed by the next update, or was the updater also unable to run? You might need to manually run the latest Firefox Nightly installer. It should detect the presence of your data and do an in-place update (refreshing the program files).

https://www.mozilla.org/firefox/all/desktop-nightly/