This browser extension forces all links within a pinned tab to open with target=_blank. This makes your pinned tabs more "sticky" in that clicking on links won't lose the pinned content.
Install it for Firefox from addons.mozilla.org.
Go to about:addons to set preferences.
Make sure you have Firefox and NodeJS (8 or higher) installed. Start developing like this:
npm install
npm start
Bump the version in manifest.json and package.json, create a git tag, execute npm run pkg, and upload the new version to the Firefox Developer Hub.
The icons for this extension are provided by icons8.