It has nothing to do with Firefox extension, nor your browser.
Change Settings-Advanced Settings, search for mirror
by default filename and filesize must equals. In case filesize is not *safe*, the download will not be treated as mirror until the download has started and final filesize is known.
You can change GeneralSettings.mirrordetectiondecision to Filename only
or to Filename_Filesize and modify GeneralSettings.mirrordetectionfilesizeequality
Your JDownloader is up2date. There have not been many core updates lately and plugin updates don't require a restart as they can be installed without restart
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JD-Dev & Server-Admin
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