Stylus: When clicking "Find Styles" in the toolbar button menu in any site, it always results in a 500 error

[darkred]

Browser: Chrome 67/Firefox 61 with Stylus 1.4.9
Operating System: win10x64
Screenshot: (please see below)

When clicking "Find Styles" in the toolbar button menu in any site, it always results in a 500 error.
On the other hand, when you click "Find more styles for this site" then the relevant search results page in userstyles.org opens ok, i.e. the site userstyles.org is working.

STR

• open https://github.com
• click "Find styles", notice the "500" error
• now click "Find more styles for this site": notice that a userestyles.org page opens and loads ok.

Screen capture from Chrome:

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I've opened the Stylus background page while I click "Find styles"
and there's no entry in the Network tab at that time.

[tophf]

USO now blocks all API requests that don't originate from their site script.
I've almost finished the workaround.
Stay tuned.

[tophf]

Uploaded 1.4.10 to CWS and AMO.

[darkred]

Thank you!