STR:

1. Install enough extensions to require scrolling main list.
2. Scroll down list of extensions.
3. Click on several extension and then activate their preferences tab.

Expected:

Extension details page is not scrolled when first visited and when going back to the main list the original scroll position is remembered like with extensions.htmlaboutaddons.enabled = false.

Actual:

The two pages share the same scroll position, have to scroll up to see tabs and then when going back to the main list the last position is lost.

All page views are affected including each main category listing, addon details page and extension shortcuts page.

cleaning per dupe