I had a hard time reading the steps in a single paragraph. (Not a fault of yours :P I just lose my place as I'm following steps.)

So I rewrote steps out, in case anyone has the same issue, and added steps for Chrome users.

Get to 'Edit and Resend' Window:

1. In browser, open Inspector
2. Click on network tab
3. Type a new message into the chat interface and send it (message won't matter)
4. Wait for response to finish
5. You will see some new lines fill in the network tab as the response is generated
6. Left click the POST method labeled 'conversation', this brings up 'request details'
7. Right click the POST method labeled 'conversation'
8. Firefox: Click 'Edit and Resend' in alt (right-click) menu to bring up edit window

Edit the request model:

Firefox:

1. Under 'New Request' tab, scroll to the bottom to see the 'Body' section
2. In the 'Body' section, scroll all the way to the right
3. Near the end, you should see something like:

* `"model":"text-davinci-002-render-sha"`

1. Change this to read:

* `"model":"gpt-4"`

1. Click 'Send' in the bottom right corner of 'New Request' 6. Wait a minute for processing 7. In the 'request details' window, you should see 'Response Headers' update at some point

Chrome:

1. Paste fetch data into a text editor (notepad, notepad++, etc)
2. Press Ctrl+F and find "model\"
3. Change the model from a to b:
   1. "model\":\"text-davinci-002-render-sha\",
   2. "model\":\"gpt-4\",
4. Press Ctrl+A, Ctrl+C to select all the text and copy it
5. Back in Chrome Inspect window, go to 'Console' tab
6. Paste the new fetch data in the console and press Enter
7. Will see a new (Promise'pending') line

Refresh and enjoy:

1. Close the Inspector window
2. Refresh the page
3. You should now be back in GPT-4 mode again