background.js

chrome.runtime.onInstalled.addListener(() => {
    chrome.action.disable();

    chrome.declarativeContent.onPageChanged.removeRules(undefined, () => {
        chrome.declarativeContent.onPageChanged.addRules([
            {
                conditions: [
                    new chrome.declarativeContent.PageStateMatcher({
                        pageUrl: { hostContains: 'amazon.' },
                    })
                ],
                actions: [new chrome.declarativeContent.ShowAction()]
            }
        ]);
    });
});

chrome.commands.onCommand.addListener(async (command) => {
    if (command === "_execute_action") {
        const [tab] = await chrome.tabs.query({ active: true, currentWindow: true });
        if (tab?.url?.includes('amazon.')) {
            chrome.action.openPopup();
        }
    }
});