Summary

Cannot edit text on pad.riseup.net without WebWorkers. Changing that protection to strict makes the website usable.

Setup

Pages affected: https://pad.riseup.net
JShelter Version: 0.20
Default JSS level

OS: Tested in Linux
Browser: The page does not work in Firefox but works in Chromium

How to reproduce

1. Navigate to a page that you are having trouble with: https://pad.riseup.net
2. Create a pad there
3. In Firefox, I cannot edit the text
4. Change WebWorker API to Strict
5. Reload the page
6. Text is editable

Expected result

At step 3 above I should be able to edit text

Actual result

Text was not editable until I tweaked WebWorker API settings

Reproducibility

reproducible in Firefox, I tried multiple profiles and versions
NOT reproducible in Chromium

Workarounds

Set WebWorker API to strict. Then it works both in Firefox and Chromium.