Browser extension

Nexus Mods, aware of your profile

See which mods your Mortar profile already has while you browse Nexus Mods, and send Mod Manager Download clicks straight to Mortar. For Firefox, Chrome, Edge and other Chromium browsers.

Get it for Firefox Chrome and Edge

Free and open source. Needs Mortar on the same computer.

The extension popup connected to Mortar: 660 Nexus mods in the Main profile and the updates available for them

What it does

Mod Manager Download, into Mortar

Click Nexus's own Mod Manager Download button and the file goes to the right Mortar profile. The extension never starts a download by itself.

Marks what you have

Mod pages, file lists and search results show which mods and files the open profile already has, so you don't download twice.

Updates and warnings

The toolbar popup lists updates for the mods in your profile and flags broken or obsolete mods on their pages.

Install

FirefoxSigned by Mozilla; updates itself Chrome, Edge and other Chromium browsersLoad unpacked from the zip
  1. Firefox: open the downloaded .xpi in Firefox, or drop it on about:addons, and confirm.
  2. Chrome and Edge: unzip the download, open chrome://extensions (or edge://extensions), turn on Developer mode, choose Load unpacked and pick the unzipped folder. A Chrome Web Store listing is on the way.
  3. In Mortar, open Settings › Downloads. It shows the extension as connected once you visit Nexus Mods.

Privacy

The extension talks only to the Mortar app on your own computer, through the browser's native messaging. It has no server, no analytics and no telemetry.

Privacy policy

Mortar's browser extension reads Nexus Mods pages in your browser to mark mods and to pass Mod Manager Download links to the Mortar desktop app installed on your own computer, using the browser's native messaging. The only data exchanged is Nexus mod ids, file ids and nxm:// links going to Mortar, and installed-mod and update information coming back. It runs only on https://www.nexusmods.com. The extension makes no network requests of its own, has no server, analytics or telemetry, and sends nothing to the developers or any third party. Your display choice and filter settings are stored in your browser's extension storage and never leave it. Uninstalling the extension removes them.

Permissions it asks for

nativeMessaging to reach Mortar on your computer; access to www.nexusmods.com only, to read and mark its pages; scripting to add its marks to Nexus tabs that were already open when it was installed; storage for your display settings; alarms to refresh the update check.

Source code

Every line is public at github.com/Rethunk-Tech/mortar-browser-extension, with no build step: the files in the release are the files in the repository.