Calibre for Linux (64-bit) for Linux

Viewer:

• Much improved search functionality. Now all matches are displayed when searching in a side bar with a few words of context. Also supports searching using regular expressions.
• Edit book: The Check book function has a new, improved CSS checker with support for CSS 3
• Edit book: Add an "Open with" action to the context menu of the files browser to easily open files with external programs.
• Viewer toolbar: Add button to easily change color schemes

Bug fixes:

• version 4.9.1 fixes a couple of regressions in 4.9.0 with Check Book reporting false positives and an error when using the source editing view in the comments editor
• Comments editor: Fix inserted blank paragraph being rendered as two lines.
• PDF Output: Fix conversion of files containing elements failing.
• Viewer: Fix failure to open some books that contain unparseable URLs.
• Viewer: Fix data displayed in side margins getting moved out of position when mouse hovers over side margin.
• Book details panel: When right clicking to save the cover, replace invalid characters in the suggested filename
• Fix harmless error popup when adding SSL key/certificate in server settings
• Dark mode: Fix colors in remove all formats except dialog

Improved news sources:

• Liberty Times