Hotlinking prevention not working

[fronaphoto]

I have a .htaccess file in my root folder with the following:

RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://fronaphoto.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://fronaphoto.com$ [NC]
RewriteCond %{HTTP_REFERER} !^http://www.fronaphoto.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://www.fronaphoto.com$ [NC]
RewriteRule .*\.(jpg|jpeg|gif|png|bmp|cab)$ - [F,NC]

However, the images on my site are still able to be hotlinked. I am not a programmer; what am I doing wrong here?

[JND]

I have never used this, but see if this works for you:

RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http(s)?://(www\.)?fronaphoto.com [NC]
RewriteRule \.(jpg|jpeg|png|gif|bmp|cab)$ - [NC,F,L]

[fronaphoto]

No, I'm trying to test it on a site such as this:
http://www.htaccesstools.com/test-hotlink-protection/
but the image still shows.

[JND]

That's odd. Using the above code and your provided tool, I received the following result:

[felgall]

No, I'm trying to test it on a site such as this:
http://www.htaccesstools.com/test-hotlink-protection/
but the image still shows.

You probably have the referrer header turned off in your browser so that it doesn't know what site you are requesting the images from and so has to serve them. Hotlink protection only blocks the images when the referrer header is on (which it will be for most visitors to most sites).