Quote:Extensions play an important part in the Firefox ecosystem; they add functionality to the browser, may improve privacy of users, or add features to sites that users visit in the browser.

Mozilla implemented an automatic update system in Firefox that updates the browser and installed extensions and other components automatically by default.
Firefox users can disable automatic updates for individual extensions or all installed extensions in the browser. (Tip: Chrome users can update extensions manually as well)

Firefox checks for updates frequently when automatic updates are enabled in the browser; this means that there is a delay between the release of an extension and the update of that extension in the Firefox browser.

You may want to force extension updates, e.g. when a new version fixes issues that you experienced or when it introduces new functionality that you want to make use of right away. Problem is, it is not really clear how you can get Firefox to download and install the new version of an extension directly.

There are quite a few options when it comes to immediate updates for extensions in Firefox. First thing you may want to do is check the installed version against the latest version.

Load aboutupport in the Firefox web browser and scroll down to the Extensions listing. Each installed extension is listed with its version; compare that version to the latest version to determine whether you have installed the most recent version.

Full reading: https://www.ghacks.net/2018/12/03/how-to-update-firefox-extensions-manually/