Exclude internal browser protocols from webRequest interception

[Copilot]

The background script's webRequest listeners were firing on internal browser URLs (about:blank, moz-extension://, etc.), which have no standard hostname — causing silent try/catch failures and unnecessary CPU usage.

Changes

• onBeforeRequest, onBeforeSendHeaders, onHeadersReceived: Added an early-exit guard immediately after the main_frame type check to skip any URL that isn't http:// or https://

if (!details.url.startsWith("http://") && !details.url.startsWith("https://")) {
  return; // or return {}
}

Uses explicit scheme prefixes (http:///https://) rather than the looser startsWith("http") to avoid unintended matches.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Exclusion des protocoles internes de l'interception des requêtes</issue_title>
<issue_description>## Contexte
Le script d'arrière-plan écoute l'ensemble des requêtes du navigateur via les filtres <all_urls> et types: ["main_frame"] pour ajuster les headers et suivre les redirections.

Problème

L'extension tente d'intercepter et de modifier les requêtes naviguant vers des pages internes du navigateur (comme about:blank, about:config, ou les URL moz-extension://). Cela engendre des erreurs silencieuses dans le bloc try/catch de onBeforeSendHeaders car les URL internes n'ont pas de nom d'hôte classique.

Scénario de Reproduction

1. Ouvrir un nouvel onglet vide (about:blank).
2. Inspecter les performances et la console d'arrière-plan de l'extension.
3. L'API déclenche les listeners pour ces pages, consommant inutilement des cycles CPU et provoquant des rejets de format d'URL.

Comportement Attendu

L'extension doit ignorer immédiatement toute requête dont le protocole n'est pas http: ou https:.

Pistes Techniques

• Fichier concerné : background.js.
• Ajouter une vérification précoce details.url.startsWith("http") dans onBeforeRequest, onBeforeSendHeaders et onHeadersReceived.

Environnement

Toutes les plateformes.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Exclusion des protocoles internes de l'interception des requêtes #60

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[Copilot]

Pull request overview

This PR prevents the extension’s background.js webRequest handlers from processing internal/non-web URLs by adding an early-exit guard for non-http:// / non-https:// schemes, avoiding unnecessary work and URL/hostname edge cases.

Changes:

• Add a scheme guard in onBeforeRequest to skip non-HTTP(S) main-frame URLs before attempting hostname tracking.
• Add the same guard in onBeforeSendHeaders to avoid header mutation work for non-HTTP(S) URLs.
• Add the same guard in onHeadersReceived to skip redirect processing for non-HTTP(S) URLs.

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