Firefox more sensitive to malformed comment tags

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Firefox is much stricter in parsing comment tags than Safari or IE.
Comments should have 2 hyphens after the exclamation point, no more, no less, and there should be no hyphens within the body of the comment.

So:
<!--
is OK, but
<!----
is not, particularly in Firefox.

Example 1 shows a table surrounded by a properly formed comment tag.
Example 2 shows the same table surrounded by a tag with too many hyphens – the table and all code between comment tags disappears – in Firefox.

View the code source in Firefox to see how firefox colorizes the code:

With properly
formed comment tag:
 Improperly
formed tag: