extension block normal use of Devtools

[mleathem]

I was unable to use Chrome's Devtools (debugging, console etc) on any website when this extension was enabled.
When a page was refreshed with Devtools launched the page would timeout - so not load.
Note I found no issue with how the extension works (JSON formatting) in normal use - this issue is about interference with chrome use for other websites. When devtools is open the extension seems to block loading of any typical website.

If I disabled the extension then Devtools works. (I discovered the interference was caused by this extension because Devtools:source showed a 'content.js' which seemed to be coming from this extension - I assume an error occurs which then blocks completition of the page render because the webpage (any page) is not json format of course).

Issue occurred on Chrome: Version 96.0.4664.110 if it's relevant.