I was writing a greasemonkey script which is using XMLHttpRequest to get a page, then post something and again get to see if the change was made. However, Opera (and presumabley firefox as well) caches the result of a get through XMLHttpRequest so the test was returning a false negative. Searching for a workarounf, I found ths site: http://www.isolani.co.uk/blog/atom/JavascriptAtomApiClientUsingXmlHttpRequest
from which I quote the idea
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I’ve worked around this by inserting a timestamp in the query string of every get request – that way it forces IE to ignore the cache.
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it works 🙂
