get_crx_urls.js

// Based on the Chrome extension: https://github.com/tonystark93/crx-download
// Adapted to be run from the Developer console
// To my surprise, when I entered the link in Chrome, it downloaded the extension and apparently tried to install it
// but it triggered a security error, for exrta safety download the extension in Firefox incognito window
(() => {
    const chromeURLPattern = /^https?:\/\/chrome\.google\.com\/webstore\/.+?\/([a-z]{32})(?=[\/#?]|$)/;
    const microsoftURLPattern = /^https?:\/\/microsoftedge\.microsoft\.com\/addons\/detail\/.+?\/([a-z]{32})(?=[\/#?]|$)/;
    const chromeNewURLPattern = /^https?:\/\/chromewebstore\.google\.com\/detail\/.+?\/([a-z]{32})(?=[\/#?]|$)/;

    function getChromeVersion() {
        const pieces = navigator.userAgent.match(/Chrom(?:e|ium)\/([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)/);
        if (!pieces || pieces.length !== 5) return undefined;
        return {
            major: parseInt(pieces[1], 10),
            minor: parseInt(pieces[2], 10),
            build: parseInt(pieces[3], 10),
            patch: parseInt(pieces[4], 10),
        };
    }

    function getNaclArch() {
        if (navigator.userAgent.includes('x64')) return 'x86-64';
        if (navigator.userAgent.includes('x86')) return 'x86-32';
        return 'arm';
    }

    const versionObj = getChromeVersion();
    if (!versionObj) return console.error("Failed to detect Chrome version.");
    const version = `${versionObj.major}.${versionObj.minor}.${versionObj.build}.${versionObj.patch}`;
    const nacl_arch = getNaclArch();

    const url = location.href;
    let match = chromeURLPattern.exec(url) || chromeNewURLPattern.exec(url);
    let platform = "chrome";
    if (!match) {
        match = microsoftURLPattern.exec(url);
        platform = "edge";
    }

    if (!match || !match[1]) {
        console.error("Extension ID not found in current URL.");
        return;
    }

    const extId = match[1];

    if (platform === "chrome") {
        const crxUrl = `https://clients2.google.com/service/update2/crx?response=redirect&prodversion=${version}&acceptformat=crx2,crx3&x=id%3D${extId}%26uc&nacl_arch=${nacl_arch}`;
        const zipUrl = `https://clients2.google.com/service/update2/crx?response=redirect&prodversion=${version}&x=id%3D${extId}%26installsource%3Dondemand%26uc&nacl_arch=${nacl_arch}&acceptformat=crx2,crx3`;
        console.log("Extension ID:", extId);
        console.log("Platform: Chrome");
        console.log("CRX URL:", crxUrl);
        console.log("ZIP URL (Base64 CRX download):", zipUrl);
    } else if (platform === "edge") {
        const crxUrl = `https://edge.microsoft.com/extensionwebstorebase/v1/crx?response=redirect&prod=chromiumcrx&prodchannel=&x=id%3D${extId}%26installsource%3Dondemand%26uc`;
        console.log("Extension ID:", extId);
        console.log("Platform: Edge");
        console.log("CRX URL:", crxUrl);
    }
})();