Describe the bug

• Header Editor rules become inactive after restarting Firefox (v144.0b6), even though they appear as "Enabled" in the rules list.
• Rules only take effect after manually toggling them (enable → disable → enable) post-restart.

Env

• Extension Version: 5.2.5 manifest v2

  Header Editor 5.2.5 manifest v2

• Firefox Version: 144.0b6

  Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:144.0) Gecko/20100101 Firefox/144.0

• Operating System: macOS Tahoe

  ProductName: macOS
  ProductVersion: 26.0
  BuildVersion: 25A354

Rules and Test address

• Rule Name: Reddit Direct Image

• Match Type: Regular expression

• Regular Expression: ^.*\.redd.it\/.*$

• Request headers:

  • accept: image/webp,image/apng,**q=0.8
  • referer: https://www.reddit.com/

• Exported Rule: HE_20250928_022545.json

Extra information

• N/A