This error appears when you try to load anything when on the tor browser with the extension or not
Tor browsers security level was set the standard and NoScript was turned off

While this may be useless as most people won't view flash on tor browser it will be nice to have

Reproduction:
1: Start Tor browser
2: Set security level to Standard
3: Visit https://ruffle.rs/demo/

Reproduced on:
Windows 10 Tor browser 10.0.5 (based on Mozilla Firefox 78.5.0esr)
Tails OS 4.14 Tor browser 10.0.7 (based on Mozilla Firefox 78.6.0esr)

If more info is needed tell me in comments

On demo (without the extension installed):

Error Info

Error name: ReferenceError
Error message: webkitAudioContext is not defined
Error stack:

624@https://ruffle.rs/demo/662.index.js:1:15436
bi@https://ruffle.rs/demo/index.js:1:34398
662@https://ruffle.rs/demo/662.index.js:1:12310
bi@https://ruffle.rs/demo/index.js:1:34398

Player Info

Allows script access: false

Page Info

Page URL: https://ruffle.rs/demo/

Browser Info

Useragent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Firefox/78.0
OS: Win32

Ruffle Info

Version: 0.1.0
Name: nightly 2020-12-15
Channel: nightly
Built: 2020-12-15T00:33:46.121Z
Commit: 709561a