Browser back button in Firefox 1.0/1.5 leads to the top of the previous article (expected: point of the page where the user read before)

1. Scrolling down on any page
2. clicking on a link
3. using the "Back" button in the Firefox browser

=> starting at the top of the article again

Using IE I didn´t experience this behavior. Is this a browser problem within Mozilla / Firefox? Or do the two following lines in the header of Confluence sites affect this behavior which probably can be changed with a configurable caching option?

<META HTTP-EQUIV="Pragma" CONTENT="no-cache">
<META HTTP-EQUIV="Expires" CONTENT="-1">

Background: 90 percent of our staff (and some customers) use Mozilla / Firefox and we want to establish program documentations in Confluence (will be a few thousand docs at least) that are linked among each other. Getting back after clicking to another documentation will let the Confluence user start at the top again and not at the point he read a few moments ago.

Thanks for an answer.