Rated 5 out of 5 stars

Googlebar 0.9.20.05 works fine on Seamonkey 2.26.1 on XP, and, I believe, on most versions of Linux. I won't touch anything Microsoft after seeing what Vista turned out to be, and the horrid Windows 7 and 8 releases.
Just hit the "install anyway" after you've hit the install button. Even the Googlebar Display button works, which stopped working a LONG time ago in Firefox. (This button hides the googlebar, allowing more screen height.) UPDATE: works on Firefox 24.
Also all the functions work and are customizable. I've found, however, the latest Google Maps "revert to classic maps" doesn't save that setting in Seamonkey, if you go there via the maps button on the original googlebar, so you HAVE to hit the question mark and revert it (per every session.) UPDATE: classic google maps is GONE. Even "My Maps" is gone.
The installer is looking for Firefox 10 for some strange reason, probably because this version was originally written for Firefox 10 but will work on Versions 2 to 19. Works on Seamonkey 1.0 to 2.2. DOES NOT work with 20 and above on Firefox and especially 30+s with the Google Chrome interface. (Too many version changes, which break nearly every extension I use every 6 weeks in Firefox prompted me to quit using it and use Seamonkey.) The Google Chrome/ Firefox 30 "Australius" combined project really had me flustered! Too bad Firefox is now almost entirely supported by Google, and I suppose that's why they now simply use Chrome as their base and not the original Netscape Navigator interface and code. UPDATE: OK it's not Google Chrome engine, still, looks like it. Why I went to Seamonkey.
Too bad Opera went the same way, as well. UPDATE: yes, Opera is now based on Google Chrome.
*6/2015
UPDATE: even the fixed version won't work with Seamonkey 2.33. Error console showing a bunch of errors in the lines of code, such as: {Timestamp: 6/17/2015 1:30:28 AM
Error: myGooglebarPrefUtil is undefined
Source File: chrome://googlebar/content/googlebarOverlay.js
Line: 248.}
No tricks I've tried will work. Reverted to Seamonkey 2.32 for now. works fine. WHY does Mozilla have to keep breaking things that work?