Firefox is loading .less files when Scratchpad is opened.
Why Firefox is loading those files? I had this problem few times when i tried to work with CSS files on websites that were using Bottstrap. It looks like Firefox is loading .map file from Bootstrap and then tries to load all .less files. When this issue appears Firefox is also duplicating requests for css files. It looks very weird.
Multiple requests: http://imgur.com/YSX4xev Loading less files: http://imgur.com/wZPabsk
Problem exists also in safe-mode.
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There was an update for bootstrap last week and in the announcement they had a Let Me Verify that for you: https://github.com/cvrebert/lmvtfy you may be interested in that.
However if this is not happening in other browsers lets open up a [webcompat.com] ticket for compatibility investigation.
It looks like you actually do not need the import("") call if you are using less files. Would that cause an import loop? I am not sure http://stackoverflow.com/questions/20.../how-to-do-less-import-without-import-literally Please also try to ask [stackoverlfow.com] there are some developer experts there as well.