With the change of development schedule and actually setting out to implement desired changes on the v12 base build that is now released, some decent progress is made in terms of version 12.1 - with the code fairly stable, I've decided to make Beta 3 a public beta for the curious and daring, to have a preview of what is to come.

Notable changes in this version compared to 12.0 release:
Some changes to memory handling which potentially keep memory use better within bounds, and disabled a redundant library with hazardous code
Additional often-requested options in the Option window under the Tabs category to reduce the need for about:config editing (Insert related tabs next to current tab, and closing the window with the last tab in a window or not)
A drop-down choice in the same screen to configure what to show in a new tab: a blank tab, the Pale Moon start page or the "QuickDial" page.
Dynamic smooth scrolling algorithm for mouse wheel, arrow keys, PgUp/PgDn/Space, etc.
Smooth scrolling enabled by default
Some color back in the navigation controls - People have enjoyed color monitors for decades, so this whole move to grey-on-grey UI elements is odd and makes things rather drab. Having some indicative color on controls also improves their intuitiveness, so hopefully a well-received improvement.
Update to the status bar code to fix pop-up status not switching sides on mouse-over, as well as using a safer allocation/destruction mechanism for controls (potentially preventing memory leaks)