Yeah, unfortunately only Chrome, Opera and Edge support MIDI connections through browser (currently).
Looks like it has passed the handshake and identified you have a Pro 3 connected. Those "Request Current Patch Edit Buffer" and "Request Specific Patch" buttons should now be able to ask the Pro 3 to send the corresponding patch. Or you can just ignore those buttons and initiate a MIDI sysex dump directly from the instrument, and the sysex window should receive all data, and count the bytes and F0F7 packets as well, if you're sending bulk dumps.
You have to sign up for an account (free) to save sysex to a file, or to upload/share patches. The save routine also does some more advanced analysis to verify the sysex is valid and complete, and determines what instrument it is for, and what type of sysex it is (edit buffer, specific patch location, wavetable, combo, bank, etc..)
I'm generally not a huge fan of cloud programs either, but in this case, its the perfect tool for the job for the PresetPatch website... makes it far easier to quickly backup/share patches and direct load them from the website. If you go to that Pro 3 page (
https://www.presetpatch.com/synth/sequential-pro-3), you can now direct load sysex patches from other users right into the Pro 3 edit buffer to audition them, and then if you like them, you can save them. I'm pretty happy with the performance so far... much more streamlined experience.
Anyways, if you run into any issues, lemme know! Cheers, Jason