I'm not sure where Perl comes into play in your question. Maybe you can show us the Perl code you use to create the output that Firefox complains about.
If this is a question about Javascript, this website is not really the place for that. Maybe Stackoverflow or somewhere else is a better place for finding answers to such questions.
In reply to Re^3: Cross-Origin Request Blocked
by Corion
in thread Cross-Origin Request Blocked
by tultalk
| For: | Use: | ||
| & | & | ||
| < | < | ||
| > | > | ||
| [ | [ | ||
| ] | ] |