It tells me the file is corrupt. :(
sorry about that.
try here...he’s hosting the *.xpi files on his home page. I assumed they were the same ...I know I know what happens when I assume. I probably should have pointed you there first. Sorry about that.
I am not a mozilla or linux guy so if you run into trouble, maybe ping him ?
https://freerepublic.com/~pollard/
one is the tree viewer which is the topic of the recent request.
the other is a posting enhancer...when replying to a post -
shortcuts to html tags - The HTML toolbar is a row of buttons which facilitate the entry of HTML tags in the reply box. It is located above the reply box.
good luck