Set a default character-encoding to UTF-8 in Mozilla Firefox

Question

How can I set the default Mozilla Firefox character-encoding to UTF-8, so if the HTML page lacks the meta tag to set charset, the character encoding is interpreted as UTF-8?

Answer 1

In Firefox, open a new tab, go to about:config and press the confirm button.

Search for the key "intl.charset.fallback.utf8_for_file" and double-click to set its value to true.

This solution works with offline HTML files that don't contain the charset meta tag.