Version 0.4.11

• Fix typos in options page
• Fix automatic notification clearing

Version 0.4.10

• Add option to limit lifetime of notifications
• Improved cosmetics on options page

Version 0.4.9

• Make some Firefox 47-only features optional
• Add 16px and 48px icons

Version 0.4.8

• Trigger a fetch when new lessons are finished
• Above change means there's no need to have a minimum time between checks