Today I decided to blog and turned the extension back on again. I was notified of updates for ScribeFire so I've just now installed the update. Instantly I have noticed that now the spell checker seems to work properly. It worked before but it was buggy in that when a menu was activated you couldn't select the properly suggested word unless you moved the mouse cursor off the menu and sneaked up on the correct / suggested word from the side. It sounds crazy I know, but that's what it required. Now it works perfect.
I'll be leaving the extension enable for a while to see if the browsing speed is once again reduced or not. I'll update this entry once I've made a determination of the results.
Well that didn't take long to determine. Speed is much reduced with this add-on enabled. I will only enable this add-on when I plan to make blog entries. Too sad...