I was having similar problems from my laptop, then discovered why I wasn't seeing the link. I'm posting this in the hope that it helps others in a similar situation.
(Side note 1: It seems that Boost / Telstra have upgraded their livechat platform since last time I used it - I don't remember being bamboozled in getting the old livechat system to work, as I temporarily was with this new one
Sorry for the trouble with the add-on data page and I can see that there are some suggestions above, such as disabling ad/pop-up blockers that may help you. I would also recommend clearing your browser cache and cookies, in case there is any caching issues causing this for you.
If you're still having trouble after trying these options, please let us know.