Rated 4 out of 5 stars
I can't remove these from context menu:
-Recently closed tabs
Reuse blank tabs:
If the current tab is a blank tab and I open a bookmark, homepage, ... by a middle click, those will open in the current blank tab, and not in a new tab (new tab is default behaviour).
(And where is the support forum?)
Read the main page to get the entry to the support forum.
You may hide any menuitem with userChrome.css. What's the harm of reusing the current blank tab? Firefox also reuses the current blank tab, but not always. For example, open a new blank tab, type www.google.com in the location bar and press Alt+Enter.