Should keep updating firefox
However, manipulation of the browser window's interface and functionality will be extremely limited by definition, and even if it wasn't, the implementation of such abilities is nearly impossible to achieve in Web Extensions.
I have fought for keeping the current system working together with Web Extensions, not only to keep all of my add-ons alive, but also because I believe a can-do-whatever-you-want extension system like exists today is the best quality Firefox has over other browsers.
This page documents features that are unique to i Macros for Firefox.
It reads: IMPORTANT: The add-on will not receive any more updates and will stop working by next November with Firefox 57.No administrative rights are required for the installation. You can use i Macros as super-bookmarks: To open the bookmark dialog right-click on the macro that you want to bookmark and select the "local" option.This option adds a link to the macro on your computer to your bookmarks.New version of Firefox web browser loads certain plugins in a separate process (plugin-container.exe) to provide you uninterrupted browsing even when certain plugins stops working.But the problem is, may use a lot of memory and slow down your computer.
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Firefox 3.6.6 making browsing slow on your computer?