I just tried doing this on my own Google Drive and had no issues. Why? To make sure it wasn't an issue on their platform. With that said, there are a few things you can try.
(1) Are any of the files you have tried ones you own? Asking this because we often have files in our drives where it has a different owner. They control what other users can and cannot see. I realize it seems like a dumb question, but wanted to ask up front. If you are unsure, create a document while in your Google Drive. There should be a button top left that says "New". Click it and create a new document. You can put junk into the document's title and body. After you are done, make sure it states it is saved and you can close out. Back in your main area of your drive, go down to that new test document and click once on it. The details on it should pop up on the right side. If you still can't see any details? You are correct that it isn't you but something else going on.
(2) Is your Firefox browser fully updated? Sometimes a browser, any browser, can run into issues if it hasn't received all its updates on your device. I run Windows and can't speak to Mac specifically. But I did do my test of my own drive in both the Firefox browser and Chrome browser.
(3) Try downloading and using Chrome browser. Don't add anything else, any extensions, when you do so. This way you can validate it isn't related to an add-on or extension.
Are any of the files you have tried ones you own? Asking this because we often have files in our drives where it has a different owner. They control what other users can and cannot see. I realize it seems like a dumb question, but wanted to ask up front. If you are unsure, create a document while in your Google Drive. There should be a button top left that says "New". Click it and create a new document. You can put junk into the document's title and body. After you are done, make sure it states it is saved and you can close out. Back in your main area of your drive, go down to that new test document and click once on it. The details on it should pop up on the right side. If you still can't see any details? You are correct that it isn't you but something else going on.
Is your Firefox browser fully updated? Sometimes a browser, any browser, can run into issues if it hasn't received all its updates on your device. I run Windows and can't speak to Mac specifically. But I did do my test of my own drive in both the Firefox browser and Chrome browser.
Try downloading and using Chrome browser. Don't add anything else, any extensions, when you do so. This way you can validate it isn't related to an add-on or extension.
Lastly, here is a link to Google support's suggestions on how to fix common issues in Google Drive. It discusses the issue you are running into as well. https://support.google.com/drive/answer/2456903?hl=en
Hope some part of my response helps you. Sorry you are running into this. I know how frustrating it can be.
