Here I'll identify the features added and bugs fixed in each release.
v0.5.1 (Released 2013-06-10)
- Added a default button to the options page
- Added remove button for search options on the options page
- Added several new search options: Wolfram Alpha and several languages via MultiWordNet
- Minor style changes to the popup
v0.5 (Released 2013-06-03)
- Multiple search options are available via a dropdown menu
- Search options can be added and one is set as the default
- Pressing enter in the popup research box now activates the default search
v0.4 (Released 2013-06-01)
- Add a ForgetMeNot item to the selection context menu
- Added predefined options for search URL in the options page
v0.3 (Released 2013-05-31)
- Customizeable lookup site
- Customizeable reminder intervals
- Update the browser action badge when a word is being refreshed to avoid an unnecessary wait
v0.2 (Released 2013-05-29)
- Ability to remove individual words from the list
- Timer job to automatically update the badge when updates are waiting
- Refresh words are no longer a giant button and are instead just a link
v0.1 (Released 2013-05-28)
- Store all settings to Chrome extension sync object for global persistance
- Advise updates at specific intervals (2 minutes, 10 minutes, 1 hour, 5 hours, 1 day, 5 days, 25 days, 4 months, 2 years)
- Text box to look up words and add them to the list
- Reset button to clear the word list