Your vendor probably meant that colons aren't great to use in URLs
because they are part of RFC 3986's reserved characters, since colon has
a special meaning in the URL. Technically, since colon has no special
meaning as part of the URL query string, they don't need to be
URL-encoded. However, Firefox is strict, and URL-encodes it anyway when
typed /pasted into the address bar.What's more, if your marketer is
building and testing the URL in Firefox, and copies it from the address
bar, it will pr...