Firstly, thanks for creating this ext. and thanks for supporting so many worthy causes.
This is quite a good product. The only thing that stops me from giving it a full five stars is the lack of configuration options.
1. Have corner banner change/rotate on page load.
-- 1a. select which banners from the list you wish to add to the rotation queue.
-- 1b. have URL details set statically for both facebook and twitter, so that should these have been selected/enabled for rotation (1a) the appropriate URL will be generated on banner-load.
2. Option to manually Edit/Add/Remove causes to/from the list.
-- edit: image / name / url
-- add: allow for multiple additions
-- remove: allow for removal of causes you do not support (or have manually added incorrectly etc)
Outside of these feature requests, the current product is excellent. Well done!!