Hi! I'm not sure I fully understand your question, so if I've got it wrong just let me know.

Are you asking about the new optional permissions feature that was introduced in the latest Firefox update? If so, more information about that can be found on the Manage optional permissions for Firefox extensions page. Some add-ons request permissions that are deemed to be optional and those can be now be enabled/disabled by the user.

Hope this answers your question.

Sir,i mean that manual Extension (addon)feature updated in latest version?

The regular release of Firefox for Android has a fixed set of Add-ons to choose from, on the menu, in the product.

The pre-release "Nightly" version of Firefox for Android has a flexible approach, but it's a little complicated: https://blog.mozilla.org/addons/2020/09/29/expanded-extension-support-in-firefox-for-android-nightly/