When I go back to the previous page using the back mouse button, and I have the AutoScroll extension enabled, the browser does go back, but it also immediately activates AutoScroll (for many but not all webpages) and it is still active when the previous page loads.
I expect that AutoScroll will not be enabled when I hit the back button on the mouse, or disabled if it was already enabled.
MacOS Intel; Version 0.99.130.2-beta (WebKit 621.1.2.111.4
Sonoma (14)