Are you using a bookmark to go to a specific page?

If you do then try to go to the main page and navigate from there to that page. It is also possible that the server is temporarily taken offline and thus unavailable.

Clear the cache and cookies only from websites that cause problems.

"Clear the Cache":

• Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

• Firefox/Tools > Options > Privacy > Cookies: "Show Cookies"

nothing happen i did what you told me to do, so i used my laptop but the same problem 403 forbidden appears.

Did you check in Google to see if there are issues reported (set the range to past week)?

Can you post a link to a publicly accessible page (i.e. no authentication or signing on required)?

http://www.camfrog.com/promo?refcd=tid|s8XiGI2FP|pmt|Exact|pcrid|17922789071|pkw|camfrog%20sign%20up&gclid=COnn3Lid5rwCFQUl4god9xIAqg

That page works for me.

Can you access the page via Google Translate with a random source language?

• http://translate.google.com/translate?hl=en&sl=fr&tl=en&u=<append URL>

See also:

• http://kb.mozillazine.org/Error_loading_websites

thank you very much for your help!