Works in Thunderbird 38 - Seems broken in TB 45 Rated 5 out of 5 stars
Unfortunately, it looks like this nice add-on is broken by the recent update to Thunderbird 45. I can no longer add the QuickFilter box to another toolbar.This user has a previous review of this add-on.
Thanks for the nice comment. However, QuickFilterToolbar has been discontinued in favor of TotalQuickFilter. If you need to use it in Tb45+, you can fix the incompatibility by editing the file /content/qft.xul in your profile /extensions (close Tb first). Change "&quickFilterBar.textbox.emptyText.base;" to "&quickFilterBar.textbox.emptyText.base1;" and save, restart.
Crashed my profile Rated 2 out of 5 stars
Unfortunately, this addon crashed my Thunderbird profile almost completely including the accounts. I had to restore the profile from a backup.
Got to love it - and 2 ideas Rated 5 out of 5 stars
Using this addon for some two months now I got used to it and got to love it. I actually replaced the 'search' with this toolbar and only needed to enable it two or three times (I am on email on average 12+ hours a day, receiving close to 300 and sending around 60 emails). However, this also gave me the idea that this addon could also do what the 'unified search' was supposed to do - i.e. add an extra option to convert the filtering into a full-blown search.
However, my other idea is a much more significant one, and I believe it could lead to more significant uptake of this addon: make it work on the calendar tab as well. There is a vast empty space in the calendar toolbar, without a single button that I would actually use. However, if I want to search for an event (which is actually a filtering function) I need another 'row'. The ideal solution would be to get the calendar header (<<Today>> February 2013 ... [Day][Week][Multiweek][Month]) into the toolbar as well - there would still be plenty space for the filter. Seems to me pretty similar to the current addon - at least, from the user side :-)
Rated 4 out of 5 stars
Is it possible to change the 'sender-recipient-subject-body" option to "sender-to-cc-subject-body" option so that recipients could be find in 'To' or 'Cc' separately or jointly. It can be achieved through 'Search Messages...' command, however, it should also be available in Quick Filter bar.