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You can apply this method at any email of Mac Mail.
After dropping it and navigating your location, you will find that dropped file with .emlx extension.
The previous versions of Mac Mail used to save emails in EML format while the all Mac OS X Mail series saves emails in EMLX format. Now it's true that in Thunderbird, import option for EML format files is available but there is no in-built functionality for EMLX files but there is one technique which you can try.
There is very poor possibility that this will work; even if somehow it works then it will take lots of time. If you have less number of files then there are some chances to complete the task but with large number of .emlx files, your system might get hanged or these files might get corrupted or damaged during the process. Because this process is capable to convert only a single EMLX file at once into Thunderbird MBOX format.
But this does not mean that you cannot get EMLX files in Thunderbird, in fact it is very easy to do if you choose the right tool. Have a look below to see, how you can have Mac OS X Mail emails in Mozilla Thunderbird.
This tool converts all EMLX file into MBOX format in seconds then you need to import the MBOX in Thunderbird, option for which is available in Thunderbird.
Also the steps to convert EMLX files into MBOX are very less and easily applicable. Just follow the given instructions:
https://www.pcvare.com/newlayout/images/how-to-img/incredimail/thunderbirdlocation.png