0.5.3 RC1

changes:

- removed active support for Firefox < 60
- maximal 250 notifications per domain and type will be rendered

new features:

- display version in options page
- added link to open options page in separate tab
- added option "Don't show again on update." for options page
- added option to highlight page action icon
- added option to control browser action icon on notifications
- added theme for browser action popup
- added badge
- added option to ignore APIs
- added protection for history length
- added protection for window name and opener

fixes:

- CSP did not work properly for worker-src
- detection if the options page was displayed in a separate tab did not work reliably
- popup text not readable in some dark themes
- display conditions for notification settings
- page action not useable with a lot of notifications
- blocking of blob-worker broke some pages

known issues:

- if a data URL is blocked the page action button does not appear