In the html of the "Add jdbc driver" there is "accept=application/zip", which forces browsers into only accepting zip files. FF allows to use a selector to "all files".
We had a similar issue with deployments uploads.

<input class="form-control ng-pristine ng-untouched ng-invalid ng-invalid-required" fileread="dac.driverData.binaryFile" type="file"
accept="application/zip" ng-model="dac.driverData.filePath" hk-valid-file="" required="" name="driverFile" id="driver-file" style="">