https://addons.mozilla.org/en-US/firefox/addon/webapi-blocker/

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WebAPI Blocker, as the name suggests, is designed to block desired JavaScript APIs. This can help to protect your privacy and prevent chances of data breach, hacking or fraud. The extension is easy to use as it has an ON|OFF button. Once you have switched the button ON, it will start to block unwanted APIs and vice versa. Adding APIs is also not a tough task; all you have to do is to type the name of the API you want to block in the designated space and then click the add button next to it. For the convenience of users, there are some commonly used APIs pre-listed in the extension.

requires to have some knowledge related to the functions of the API. If they have mistakenly blocked an API that is important to load a website, the performance of that particular website may be impacted. It may not load completely or become unresponsive. If such an issue occurs, check the APIs you have blocked, try unblocking them, refresh the tab, and check whether the website loads correctly or not. All in all, installing WebAPI Blocker extension could be a viable way to protect your privacy; however, it is important to be aware of the functions of important APIs.