Controls Disappeareing in firefox 4

Sometimes the controls in the dialog box, and even in the webpages, disappear in Firefox 4. For example, the items in the dropdownlist on the firefox page disappeared when i was browsing the new features in firefox 4. I had tried Firefox 4 beta and that too had this problem

Firefox 3.6.* and earlier set the downloaded file's modification time to the current time. In Firefox 4.0 the behavior has been changed, if a server returns a timestamp telling when the file was last modified (Last-Modified header), it is used instead.
You can revert to the previous behaviour by using the [https://addons.mozilla.org/en-US/firefox/addon/93121/ Download Timestamp] add-on.

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