[Addons] The Slow Script prompt is displayed after enabling the "Dark Reader" addon and small performance issue occur while navigating

[Softvision-RemusDranca]

[Affected Versions]:

• Firefox Reality version 12 RC1 (cc3eab03)

[Affected Platforms]:

• Oculus Quest - Android 7.1.1
• HTC Vive Focus - Android 7.1.2
• Pico Neo2 - Android 8.1.0

[Prerequisites]:

• The Firefox Reality browser is open.

[Steps to reproduce]:

1. Install the "Dark Reader" addon from the Addons page.
2. Navigate for example to Youtube website.
3. Observe the behavior.

[Expected results]:

• The website is easily navigated/loading.

[Actual results]:

• The Slow Script prompt is displayed and the website is taking more time to load than usual.

[Notes]:

• The Slow Script prompt is mostly displayed after enabling the addon, but the small performance issues (loading) are visible even after the addon is enabled, while navigating.
• In one attempt the cards from Homepage where cut when navigated back on, but this behaviour was dismissed after a page refresh.
• Attachments for the issue:
  • Screen Recording: link.

[Softvision-RemusDranca]

The slow script prompt is also displayed after resuming the app while having websites opened.