A short tutorial on how to fix addon problems.
Throughout my stay here i have fixed many problems with addons that do not work, simply because they return a 403 error if you look at the google dev console. I will give the most common example - these are adnoyer and paintit.
Adnoyer - when you try to add onlick elements you get an error? Why?
Because this is due to mod_security, which blocks onclick elements, because it simply detects them as malicious code. Much the same applies to paintit, except that other code requests are sent there, which are also detected as malicious.
To fix this, just add these two rules to your .htaccess file which is located in the same folder as your chat files on your hosting.