Install in Firefox

Use Firefox 142 or later, on desktop or Android. The new anmerko Firefox Add-ons listing is awaiting publication. The download note below states the current approved Mozilla-signed build’s installed name.

Download the signed bundle

Download for Firefox (0.5.4.1)
This approved legacy Briefmark build appears as Briefmark after installation.

The public download above is the current approved Mozilla-signed XPI.

Keep the .xpi file intact. Do not unzip it, rename a ZIP to .xpi, or install the firefox-unsigned.zip, firefox-source.zip, or GitHub Source code archive. Those files are not signed installers.

Desktop

1. Download the signed .xpi to your computer.
2. Enter about:addons in Firefox’s address bar and select Extensions.
3. Open the gear menu (Tools for all add-ons) and choose Install Add-on From File….
4. Select the .xpi, then review and accept Firefox’s installation prompt.
5. Open a regular website and activate the extension, using the installed name shown above, from the Extensions menu. Add a comment to check the installation. You can pin it to the toolbar for easier access.

Mozilla’s add-on installation guide describes installing a signed add-on from a file.

Android

Manual file installation requires Android 10 or later and Firefox 142 or later.

1. Download the signed .xpi from this page onto your phone.
2. In Firefox, open Settings → About Firefox. Tap the Firefox logo five times, until the debug-menu confirmation appears.
3. Return to Settings and choose Install extension from file.
4. Select the downloaded .xpi and accept the installation prompt.
5. Open a website, then choose the installed name shown above from Firefox’s Extensions menu. Tap an element and add a comment.

If the file-install option is missing, check the Android version and repeat the logo taps. Mozilla confirms that file installation is unavailable below Android 10. Firefox on iPhone and iPad does not support these extensions.

Update a manual installation

Save open drafts, download the newer approved signed .xpi, and repeat the file-install steps in the same Firefox profile. Accept the update without first removing the extension, then refresh your open websites. This manual track has no custom update URL.

Ordinary updates retain saved feedback. The renamed anmerko build starts with empty comments and default settings. It does not import Briefmark data. Export feedback you want to keep before installing.

Export your feedback before removing the extension or changing profiles. There is no automatic transfer between browsers or devices.