What is the point of an add-on that doesn't work as it is supposed to and hasn't been updated in years?
I don't blame the author for keeping the Donate button working, but it would be nice if this author actually did some work on the add-on.
I also don't blame the author for giving up on this add-on since Mozilla is forever modifying the way Firefox works and screwing up dozens of add-ons in the process.
Edit after Mr Cox's reply:
This add-on was one of my "must haves" through the years, along with All-In-One-Sidebar, Tree Style Tabs and about 20 others.
It is so annoying when Mozilla changes some basic internal Firefox functionality that breaks a whole group of add-ons. I run 93 add-ons so I am always loathe to "upgrade" as I know I will lose many add-ons.
Now I, too, have stopped using your Autosizer add-on. Instead I've put:
the URL window and some add-on icons on the Menu Bar
the search bar and some search related add-on icons on the Bookmarks bar, and
the bookmarks on the Navigation bar.
My next major effort will be to upgrade from v28 to v54, replace whatever add-ons no longer work, and find new add-ons that make v54 look like v28, eg. Classic Theme Restorer.
Wouldn't it be nice if Firefox always looked the same after an "upgrade", add-ons always worked , and the only difference in the new version was faster speed, and increased reliability and functionality?