Error generating selector in SFDC

[twschiller]

Describe the bug

A clear and concise description of what the bug is.

To Reproduce

Steps to reproduce the behavior:

1. Use 1Password credential Mark's Salesforce (Mark)
2. Go to https://pixiebrix3-dev-ed.lightning.force.com/lightning/r/LiveChatTranscript/5708X00000Gnbs2QAB/view?channel=LIVE_AGENT
3. Use extract from page and click on an element

Actual behavior

An error toast is shown in the Page Editor

Expected behavior

The Page Editor generates a selector

Discussion

• Running selectors in the content script works (if you manually put in a selector). So there's something related to the selector inference code?