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This article applies to older versions of Firefox (versions 43 and below). If you see the error message Your connection is not secure, see the article What does "Your connection is not secure" mean?. This article describes why the This Connection Is Untrusted error message
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Give Firefox a tune up Refresh Firefox
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Instead of hunting all over Firefox to change various website permissions, the Permissions Manager now collects them all in one place. You can customize permissions for individual sites or set the default permissions for all sites. This article will get you started. Note: Individual
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Public Key Pinning helps ensure that people are connecting to the sites they intend. It allows site operators to specify who can issue valid certificates for them, rather than accepting any one of the hundreds of built-in root certificates that ship with your browser. If a site makes
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One of the great things about Firefox is how customizable it is. In fact, you can even make it look like the old Firefox if you want. Do you miss the Add-ons bar, small icons or tabs on bottom? No problem. We'll show you how to get them back. Note: This applies to the latest Firefox
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This page includes rules and guidelines for using the Mozilla forums. See also our Legal Notices. We will assume good faith when dealing with violations; we will only warn or ban users who repeatedly or blatantly violate the rules. Administrators have the final say in modifying,
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If you're having problems with Firefox, resetting it can help. The reset feature fixes many issues by restoring Firefox to its factory default state while saving your essential information like bookmarks and open tabs. Table of Contents1 Reset Firefox to its default state2 What
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This article is obsolete.   For escalation guidelines for Support Forum Moderators, see Forum Moderation and Escalation Guidelines.
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This article applies to version 37 and higher The screen casting feature on Firefox now lets you send videos or web pages to your streaming player so you can view them on a second screen, like your TV! Table of Contents1 Enable this feature2 Send videos to your Roku3 View websites
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As of November 30th 2016, the persona.org service is no longer supported and is shutting down. Persona.org and related domains will be taken offline before the end of 2016. Mozilla Persona is an easy way to sign in to lots of websites using just your email address and a single
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Templates are a way of reusing pieces of content in Knowledge Base articles. Instead of writing a set of instructions multiple times, you can create and update it in one place, and then refer to it in other pages. The other pages will stay up-to-date with changes to the Template automatically! Localizers:
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This article is obsolete.  The Forum Responses tool is no longer available. This article explains how to create or improve common forum responses that are available to contributors for use in support forum replies. 
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This article is obsolete and has been archived. Before contributors can write the text for a new article, they must fill out the description. By categorizing an article like this, readers can find the article more easily. Here is how to do this.
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This article is obsolete.   For escalation guidelines for Support Forum Moderators, see Forum Moderation and Escalation Guidelines.
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Thanks for contributing to the support. mozilla. org (SUMO) website! It's through your efforts that we are able to provide help to so many users. Table of Contents1 What's new at SUMO2 Contributor Help Wanted3 Helpful links for contributors4 Staying updated5 Communication
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REDIRECT http://www.mozilla.org/firefox
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Mozilla Support (SUMO) Mozilla Support (SUpport.MOzilla.org) is a global gathering of many enthusiastic and dedicated people whose passion is to help all users of Mozilla's software and products. SUMO operates on the same principle that Mozilla does: a core of staff coordinating
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REDIRECT Changes to toolbars and window sizes are not saved
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If the Restore Previous Session is greyed out, there might be something wrong with the files that store your recovery sessions. If you've previously made a copy of the files, you can use them to restore your sessions. Here's how: Open the profile folder. Close Firefox In
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