chad-music/chad-magnets/background.js

browser.browserAction.onClicked.addListener(()=>browser.runtime.openOptionsPage());

async function handleMessage(request) {
  if (request.magnet) {
    const opts = await browser.storage.local.get();
    if (!opts.enabled) return new Promise((r,e) => e(new Error("Extension is not enabled")));
    return fetch(opts.url, {
      method: 'POST',
      body: JSON.stringify({url: request.magnet})
    }).then(res => res.text()).then(text => {
      if (text === 'OK') return text;
      return new Promise((r,e) => e(new Error(text)));
    });
  }
}
browser.runtime.onMessage.addListener(handleMessage);