Page loading multiple times.

I've noticed today that when using the go to newest unread post button the page loads three or four times. It's not visibly refreshing, but if I right-click on the back button it'll show the distinct visits, and Firebug shows a "Error: Permission denied to access property "toString"" message. It's not affecting my use of the site other than making the back button a little less useful, just thought I'd bring it up in case it's symptomatic of something else.

Using Firefox 37.0.2, clicked the unread posts button once from the subforum with no further navigation within the thread.

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You're right, I'll check that out, thanks!

When I saw this thread, I checked my Firefox version , and it was 37.0.2, but the latest version started downloading and I'm now on 38.0.1.
Can't reproduce the problem, so maybe try updating?

I'm still getting it on 38.0.1, but yes, it does seem to be Firefox related. I wonder if an Addon is causing it.

These are what I have installed, still getting the issue with them all disabled. It's no big deal anyway.

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Something similar here, I have to backspace at least twice to get to the previous page.
I only noticed it happening lately

(Also Firefox - happens on my work computer too which has no add ons)

It's something to do with the ads, I updated them recently to load asynchronously, but it's causing this as a side effect. I'll look into it this evening in more detail.

I can't figure out why the async ads were causing this so I've reverted it to the old type. Thanks for letting me know.

Back to normal now- thanks