Can't even get past the first lesson

I just started today, and this first HTML lesson seems simple enough. According to the instructions, all I have to do is add the word “World” after “Hello”. My code looks like this:

<h1>Hello World</h1>

I get a message below saying; SyntaxError: invalid regular expression flag s

What am I doing wrong? Is this more complicated than the instructions make it seem?

I’ve edited your post for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.

See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (’).

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Hello and welcome to the freeCodeCamp community~!

This is a known issue which is typically resolved by ensuring you are running on the most updated version of your browser.

I just updated Firefox, and that worked, thanks!