[Support] uMatrix

[gorhill (Raymond Hill)]

@Gothic_Death

it will keep going to the top and not let you edit anything if you have to move the scroll bar down

[Support] uMatrix

The one which still exists is that just hovering over the matrix cells will always reset the scroll position to the top. So if you have a long list of domains and want to set a rule for a row which is visible only if you scroll down, the matrix will jump back to the top. Bugzilla issue: https://bugzilla.mozilla.org/show_bug.cgi?id=1324499.