In Mac, its a normal behavior that closing the firefox window by clicking the red button closes all the tabs while keeping firefox running in background, so automatic session restore does not work unless firefox is quit using Command+Q. Is it great that restoring the session that was closed the last works great with this add on. However is it possible to restore the session automatically from the last closed or autosave (whichever is latest) state when firefox is started when there was no firefox tab-window left (browser window only, ignoring the download, histrory, bookmark window or even the firefox program running in the background as the case with mac). This will make closing and restarting firefox window in mac so smooth, you may make this feature optional in the setting.

FRQ:
1. Restore last closed state or or autosaved state which ever is latest, when firefox window opens when there is no existing firefox browser window. (this makes it more intuitive to close firefox in mac using the red button and restarting).
2. Retina compatible high resolution logo of the add on, and may be a change of color of logo.
3. Relative time in the session list, such as 15 minutes ago, 1hr ago in addition to the existing timestamp.

Keep up the great work,
Milan