Mozilla Firefox certificate message | Avast

Please enable JavaScript

For the best Support Center experience, JavaScript must be turned on in your browser settings

Enabling JavaScript and cookies in your web browser

When you make a purchase via the <a href="https://www.avast.com/store" target="_blank">Avast Store</a>, you may be notified that you need to enable JavaScript and / or cookies in your web browser. This is because the Avast Store is unable to load and function correctly without these settings enabled. To enable JavaScript and / or cookies, refer to the information in the relevant section below according to your web browser: <ul><li><a href="#idt_010">Google Chrome</a></li><li><a href="#idt_020">Mozilla Firefox</a></li><li><a href="#idt_030">Safari</a></li><li><a href="#idt_040">Microsoft Edge</a></li><li><a href="#idt_050">Avast Secure Browser</a></li><li><a href="#idt_060">Opera</a></li></ul> <h2 id="idt_010">Google Chrome</h2> <h4>Enable JavaScript</h4> To enable JavaScript for all websites that you visit using Google Chrome, refer to the instructions under Step 1: Turn on JavaScript in the following article from Google Chrome Help: <ul><li><a href="https://support.google.com/chrome/answer/6138475?hl=&co=GENIE.Platform=Desktop" target="_blank">Google Chrome Help ▸ Fix videos & games that won't play</a></li></ul> If you prefer to enable JavaScript only for webpages that are part of the avast.com domain, follow the steps below: <ol><li>Go to <code>⋮</code> Menu (three dots) ▸ Settings.</li><li>Click Privacy and security ▸ Site Settings.</li><li>Under Content, click JavaScript.</li><li>Click the Add button next to Allowed to use JavaScript.</li><li>Type <code>[*.]avast.com</code> and click Add.</li></ol> [*.]avast.com now appears on your Allowed to use JavaScript list. This means that all webpages with a web address beginning avast.com (such as www.avast.com/store) allow JavaScript. <h4>Enable cookies</h4> To manage your cookie preferences in Google Chrome, refer to the instructions under Change your cookie settings in the following article from Google Chrome Help: <ul><li><a href="https://support.google.com/chrome/answer/95647?hl=&co=GENIE.Platform=Desktop" target="_blank">Google Chrome Help ▸ Clear, enable, and manage cookies in Chrome</a></li></ul> <h2 id="idt_020">Mozilla Firefox</h2> <h4>Enable JavaScript</h4> JavaScript is enabled for all websites by default in Mozilla Firefox. If you have disabled JavaScript using a browser add-on that allows you to customize your JavaScript settings, you need to re-enable JavaScript using this add-on. For more information about JavaScript settings in Mozilla Firefox, refer to the following article from Mozilla Support: <ul><li><a href="https://support.mozilla.org/kb/javascript-settings-for-interactive-web-pages" target="_blank">Mozilla Support ▸ JavaScript settings and preferences for interactive web pages</a></li></ul> <h4>Enable cookies</h4> To manage your global cookie preferences for all websites that you visit using Mozilla Firefox, refer to the following article from Mozilla Support: <ul><li><a href="https://support.mozilla.org/kb/websites-say-cookies-are-blocked-unblock-them" target="_blank">Mozilla Support ▸ Websites say cookies are blocked - Unblock them</a></li></ul> If you prefer to enable cookies only for webpages that are part of the avast.com domain, follow the steps below: <ol><li>Open any webpage from the avast.com domain in your browser window (this is any URL that has avast.com at the beginning).</li><li>Click the shield icon to the left of the address bar.</li><li>Click the blue (ON) slider next to Enhanced Tracking Protection is ON for this site so that it changes to gray (OFF).</li></ol> Cookies are now enabled for all webpages that are part of the avast.com domain. <h2 id="idt_030">Safari</h2> <h4>Enable JavaScript</h4> JavaScript is enabled for all websites by default in Safari. If you have manually disabled JavaScript, follow the steps below to re-enable it: <ol><li>Ensure that the Safari window is open and active.</li><li>Click Safari ▸ Preferences... on the left side of the Apple menu bar.</li><li>Select the Security panel, and ensure the box next to Enable JavaScript is ticked.</li></ol> JavaScript is now enabled for all websites that you visit using Safari. <h4>Enable cookies</h4> It is not possible to enable cookies for specific websites in Safari. However, you can manage global cookie preferences that apply to all websites you visit using Safari. For more information about the options available, refer to the following article from Apple Support: <ul><li><a href="https://support.apple.com/guide/safari/sfri11471/13.0/mac/10.14" target="_blank">Apple Support ▸ Manage cookies and website data in Safari on Mac</a></li></ul> <h2 id="idt_040">Microsoft Edge</h2> <div class="note">The information below applies to the new version of Microsoft Edge (version 79.0.309 and higher).</div> <h4>Enable JavaScript</h4> To enable JavaScript for the entire avast.com domain, follow the steps below: <ol><li>Go to <code>…</code> Menu (three dots) ▸ Settings.</li><li>Select <code>☰</code> Settings in the top-left corner.</li><li>Select Cookies and site permissions ▸ JavaScript.</li><li>Click the Add button next to Allow.</li><li>Type <code>[*.]avast.com</code> and click Add.</li></ol> [*.]avast.com now appears on your Allow list. This means that all webpages with a web address beginning avast.com (such as www.avast.com/store) allow JavaScript. <h4>Enable cookies</h4> To manage global cookie preferences that apply to all websites you visit using Microsoft Edge, refer to the following article from Microsoft Support: <ul><li><a href="https://support.microsoft.com/search?query=enable%20cookies%20in%20edge" target="_blank">Microsoft Support ▸ Allow or Block Cookies in the new Microsoft Edge</a></li></ul> If you prefer to enable cookies only for the avast.com domain, follow the steps below: <ol><li>Go to <code>…</code> Menu (three dots) ▸ Settings.</li><li>Select <code>☰</code> Settings in the top-left corner.</li><li>Select Cookies and site permissions ▸ Cookies and site data.</li><li>Click the Add button next to Allow.</li><li>Type <code>[*.]avast.com</code> and click Add.</li></ol> [*.]avast.com now appears on your Allow list. This means that all webpages with a web address beginning avast.com (such as www.avast.com/store) allow cookies. <h2 id="idt_050">Avast Secure Browser</h2> <h4>Enable JavaScript</h4> To enable JavaScript for the entire avast.com domain, follow the steps below: <ol><li>Go to <code>⋮</code> Menu (three dots) ▸ Settings.</li><li>Go to Privacy and security ▸ Site Settings.</li><li>Under Content, click JavaScript.</li><li>Click Add next to Allow.</li><li>Type <code>[*.]avast.com</code> and click Add.</li></ol> [*.]avast.com now appears on your Allow list. This means that all webpages with a web address beginning avast.com (such as www.avast.com/store) allow JavaScript. <h4>Enable cookies</h4> To enable cookies for the entire avast.com domain, follow the steps below: <ol><li>Go to <code>⋮</code> Menu (three dots) ▸ Settings.</li><li>Go to Privacy and security ▸ Site Settings.</li><li>Under Content, click Cookies and site data.</li><li>Click Add next to Sites that can always use cookies.</li><li>Type <code>[*.]avast.com</code> and click Add.</li></ol> [*.]avast.com now appears on your list of Sites that can always use cookies. This means that all webpages with a web address beginning avast.com (such as www.avast.com/store) allow cookies. <h2 id="idt_060">Opera</h2> <h4>Enable JavaScript</h4> To enable JavaScript for all websites that you visit using Opera, refer to the instructions under Manage JavaScript in pages in the following article from Opera help: <ul><li><a href="https://help.opera.com/en/latest/web-preferences/" target="_blank">Opera help ▸ Web preferences</a></li></ul> If you prefer to enable JavaScript only for the avast.com domain, follow the steps below: <ol><li>Go to Menu (the O icon) ▸ Settings ▸ Advanced.</li><li>Click Privacy & security ▸ Site Settings.</li><li>Under Content, click JavaScript.</li><li>Click the Add button next to Allow.</li><li>Type <code>[*.]avast.com</code> and click Add.</li></ol> [*.]avast.com now appears on your Allow list. This means that all webpages with a web address beginning avast.com (such as www.avast.com/store) allow JavaScript. <h4>Enable cookies</h4> To enable cookies for all websites that you visit using Opera, refer to the instructions under Manage cookies in pages in the following article from Opera help: <ul><li><a href="https://help.opera.com/latest/web-preferences/" target="_blank">Opera help ▸ Web preferences</a></li></ul> If you prefer to enable cookies only for the avast.com domain, follow the steps below: <ol><li>Go to Menu (the O icon) ▸ Settings ▸ Advanced.</li><li>Click Privacy & security ▸ Site Settings.</li><li>Under Content, click Cookies and site data.</li><li>Click the Add button next to Sites that can always use cookies.</li><li>Type <code>[*.]avast.com</code> and click Add.</li></ol> [*.]avast.com now appears on your list of Sites that can always use cookies. This means that all webpages with a web address beginning avast.com (such as www.avast.com/store) allow cookies. <div class="conditions"> <ul><li>All paid Avast consumer products</li></ul> <ul><li>Microsoft Windows 11 Home / Pro / Enterprise / Education</li><li>Microsoft Windows 10 Home / Pro / Enterprise / Education - 32 / 64-bit</li><li>Microsoft Windows 8.1 / Pro / Enterprise - 32 / 64-bit</li><li>Microsoft Windows 8 / Pro / Enterprise - 32 / 64-bit</li><li>Microsoft Windows 7 Home Basic / Home Premium / Professional / Enterprise / Ultimate - Service Pack 1, 32 / 64-bit</li></ul> </div>

Message: "Connection verified by a certificate issuer that is not recognized by Mozilla."

When you visit a website in Mozilla Firefox, the Site Identity button (the padlock icon) appears in the address bar to the left of the web address. By clicking the padlock icon, you can verify if the website you are viewing is encrypted. In some cases, you may see the message Connection verified by a certificate issuer that is not recognized by Mozilla., even if the website is verified as secured.

In addition, your Firefox settings screen may show the message Your browser is being managed by your organization..

These messages are caused by the Web Guard feature, which is found in Avast One, Avast Free Antivirus, and Avast Premium Security. In order to scan encrypted web content, Avast needs to install its self-signed certificate, which results in these messages appearing in Mozilla Firefox.