Microsoft released Windows 10 Insider Preview 14342 for testers. New Insider preview build also comes with lots of fixes and bugs.  Microsoft released last Insider build 14332 on April 27. Gabriel Aul of Microsoft posted information about Redstone build 10.0.14342 on twitter.

New in Windows 10 Insider Preview Build 14342:

Updates for Extensions in Microsoft Edge: Now all extensions can now be downloaded directly from the Windows Store. Insiders need to install their all current extensions again. Then in future updates, your extensions will be automatically re-downloaded and installed. AdBlock and Adblock Plus are now available for download in the Windows Store in addition to Pin It Button, Mouse Gestures, Reddit Enhancement Suite, Microsoft Translator, and OneNote Web Clipper. Install one of either AdBlock or Adblock Plus as having them both running at the same time can cause issues with viewing websites.

Important note: There is a bug in this build that occurs if you turn off all extensions without uninstalling them, you may not be able to close the browser or get context menus to work. To avoid this issue, uninstall any extensions you no longer want to use instead of turning them off. If you do hit this issue, to get out of this state you will need to turn on one or more extensions or uninstall all extensions, kill any Microsoft Edge processes running in Task Manager, and restart Microsoft Edge.

Real-time web notifications in Microsoft Edge: Microsoft Edge now supports real-time web notifications, which allow participating websites to send notifications to you via Action Center, with your permission. For example, when your friend sends you a message on Skype for Web while you’re busy in the Xbox app, you won’t miss a thing. A notification from the website will appear in Windows, just like an app might send. Click on the notification and you’ll be right back in Microsoft Edge at the site that sent it!

Swipe navigation in Microsoft Edge: With this build, you can now swipe from anywhere on the page to get back to your previous page. This will be coming in the next Mobile build soon.

Bash on Ubuntu on Windows Improvements: Symlinks within the Windows Subsystem for Linux are now functional on the mounted Windows directories. Users with non-Latin Windows usernames are now able to install Bash on Ubuntu on Windows.

Skype UWP Preview Update: The Skype UWP Preview app has been updated with a dark theme and can switch between different Skype accounts. You can expect a mobile release in the next few weeks.

Updated Windows Ink Workspace icon: Updated the Windows Ink Workspace icon on the taskbar.

Updated visuals for User Account Control dialog: The UAC dialog now supports dark mode.

Middle-click for dismiss in Action Center: Action Center now supports dismiss middle-clicking on a notification via the middle button scroll wheel on your mouse to a single notification. Middle-clicking on an app’s name will dismiss all the notifications listed for that app.

Apps for websites: You will soon be able to redirect certain websites to open with an app instead. While there are currently no apps that support this. But options are now enabled in settings, Settings > System > Apps.

Feedback Hub improvements: Now the Feedback Hub will suggest categories and subcategories based on the title and description you entered.

Check here for fixes in Insider preview PC Build 14342.
Check here for known issues with PC Build 14342.