When I close firefox I get the message to stop or restart the script chrome://browser/content/sanitize.js:135

Pop - up when I close firefox, it very often

Which may be caused by disabling cookies via "clear recent history".

  • https://support.Mozilla.org/KB/clear+recent+history
  • Firefox/tools > Options > privacy > Firefox will be: "Use the custom settings for history" > [X] clear history of Firefox closing > settings
  • Firefox > history > clear recent history or tools > clear recent history

If you use "Clear recent history" to clear Firefox cookies also tries to clear cookies from plugins like Flash (LSO), and then starts a process plugin-container for each plug-in, and which can add extra time and can cause a script error does not appear.

Make sure that all plugins are up-to-date.

Exclude cookies from "Clear recent history" to see if that helps.

Allow all cookies expire when you close Firefox to delete unwanted cookies and keep those with an exception permit.

Make sure that you do not erase the "Site preferences" because that will remove all exceptions.

  • Tools > Options > privacy > Cookies: "Keep until the": "closing of Firefox".

Tags: Firefox

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