Usually this message appears when (1) you use the Back button and (2) the page was generated by submitting a form and (3) the server instructed Firefox not to store the page but to re-request it. If it occurs automatically, I wonder whether the page is reloading itself??

By the way, what version of Firefox are you actually running? Your post says 3.6.13, which is quite old now and if you just updated, that information could be obsolete. Can you check Help > About Firefox?

The page is Marketwatch.com Like most financial sites, it reloads itself. 3.6.22

I'm using 6.0.2 and have this problem (also with Marketwatch) and it has nothing to do with the 'back' button

I've gone back to 3.6.12 NO other choice unless I want to waste a lot of time.

Perhaps someone should report this to MarketWatch. There are ways for web developers to work around this issue (GET after POST, for example).

This is a longstanding issue. Examples:

how do i stop this-To display this page, Firefox must send information that will repeat any action (such as a search or order confirmation) that was performed earlier.?

To display this page, Firefox must send information that will repeat any action (such as a search or order confirmation) that was performed earlier

In past discussions about this message, I have never seen an easy solution. Arguably it should be made a user preference: those who prefer to be warned about the risk that they will double-submit a transaction or instruction on a poorly designed site can have their warning, and those who prefer to take their chances can take their chances. Not sure whether that is on anyone's "to do" list.

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Separate issue: I wasn't aware of any difference between 3.6.12 and 3.6.13, but both are riddled with security vulnerabilities so it's hard to recommend using either of them at this point.