More bug fixes on top of v0.10.1 and v0.10.2.

Bug fixes

• Fix Webview-related crashes on some older Android versions
• Fix some snackbars not being displayed in viewport properly

Minor changes

• Adjusted tap regions in vertical/webview/continuous vertical reading modes
  • Top and left parts navigate up
  • Bottom and right navigate down
• Tweaked download badge color

Under the hood

• Retrieving the extensions list now uses only 10% of the data as before