This isn't garbage, but Firefox shows the response encoded as base64 to avoid issues with characters that can't be displayed:

PHN0eWxlIHR5cGU9InRleHQvY3NzIj4uc3RhbmRhcmRfX3N0YW5kYXJkLWNvbnRhaW5lcl9fXzFGVFJ3e21heC13aW

decoded via atob('PHN0eWxlIHR5cGU9InRleHQvY3NzIj4uc3RhbmRhcmRfX3N0YW5kYXJkLWNvbnRhaW5lcl9fXzFGVFJ3e21heC13aW') this becomes:

<style type="text/css">.standard__standard-container___1FTRw{max-wi

Thanks. Yep. I thought it might be encoded. I should have checked that. Is there a way to get the dev tools to show the response as unencoded text? Is it showing it as base64 because of the content-type `application/octet-stream`? I'm just trying to understand why it's different to html or text response for example.

Yes, that is quite likely the cause as this application/octet-stream content-type can be used for all kind of data. I do not get .mst files when I visit your link, so I can't check its initiator. You will also see the response being encoded for (woff) font files. HTML files and image files are among the content that is rendered.

• https://developer.mozilla.org/en-US/docs/Tools/Network_Monitor
• https://developer.mozilla.org/en-US/docs/Tools/Network_Monitor/request_details

Thanks. You need to click the Click the `explore` sub menu to get .mst files. See in my screenshot