Firefox (64-bit)

What's new in this version:

- Text zooming in the Message View is now possible, using CTRL+mouse wheel up/down, CRTL+touchpad two-fingered vertical swiping, or the Message View's right-click menu.
- GtkColorChooser is now used in the Spell Checking preferences, Colour Label preferences, and the folder Properties pages.
- * 'Default From:' has been added to the Compose page of the folder Properties. This allows setting an email address which will override the Account's email address.
- An option has been added to the 'General' page of the folder Properties, 'Skip folder when searching for unread or new messages', so that the folder can be skipped when using Go To next/previous unread/new message.
- * 'By Sender' has been added to '/Tools/Create filtering rule/...' and '/Tools/Create processing rule/...'
- The option 'Run processing rules before marking all messages in a folder as read or unread' has been added to '/Configuration/Preferences/Display/Summaries'.
- It is now possible to add a toolbar button to 'Run folder processing rules'.
- The Actions configuration list now has 'Top' and 'Bottom' buttons.
- In '/Tools/List URLs' it is now possible to CTRL+c or right-click a list item and 'Copy URL'; copying multiple selections is also possible. Phishing URLs are now indicated in red by default. This uses the colour defined in the hidden preference, log_error_color.
- The method of handling Tags has been improved.
- When using the separate Message View the Enter key will open the currently selected message in the Message List. So, for example, if you delete the current message, pressing Enter will open the next message without having to leave the separate Message View.
- The quicksearch type-ahead keypress delay is now customizable using a hidden preference ("qs_press_timeout").
- Improvements to the storage of OAuth2 refresh tokens.
- A "View all" button has been added to the Themes preferences page in order to preview all icons of a theme.
- The term 'master passphrase' has been replaced in the UI with 'primary passphrase'.
- The label 'SSL/TLS' has been replaced with 'TLS' in the UI.
- Chmod 0600 is set on log files, history files, saved parts, etc.
- * "Keyword Warner" plugin has been added. This shows a warning when sending or queueing a message and a reference to one or more user-defined keywords are found in the message text.
- Adding a new RSSyl feed or subscribing to a Webcal will automatically suggest using any suitable URI found on the clipboard.
- The user manuals have been updated.
- Updated translations: Brazilian Portuguese, British English, Catalan, Czech, French, Indonesian, Polish, Romanian, Russian, Slovak, Spanish, Turkish.

Fixed:
- 'litehtml plugin loops (hangup)'
- 'Error: Certificate is for invalid2.invalid, but connection is to imap.gmail.com'
- 'vcalendar segfault if in invitation email and switch to another folder'
- 'Improve text strings for OAuth2'
- 'Fancy crashes when opening an email'
- 'Uses deprecated ghostscript operator'
- 'msg window too small in 3 column layout'
- 'Thread safety issues in signature checking code'
- 'Problems exiting/closing Claws Mail'
- 'Address book causing claws to terminate unexpectedly'
- 'Setting msgview_date_format=1 does not work'
- 'Tab for address selects second entry'
- 'Filesize in kilobytes versus kibibytes'
- 'Fancy plugin with GTK3 seems to ignore content encoding'
- When using 'hide_timezone' use UTC when generating MessageID
- Non-translation of some button labels
- The initial position of the (X-)Face image
- Return receipts from accounts without a name
- Folderview pixmaps not being updated after icon theme change until restart
- Spell checker underlining when black is chosen
- Text on various buttons
- Scrolling in a message's attachments bar (scrolling left or right were scrolling down).
- Scrolling not working when GTK smooth scroll is set
- Scroll to next/prev page in pdf_viewer
- Build error with -Werror=format-security
- Invalid crypto engine (gpgme_op_verify failed)
- VCalendar tooltip in Day View showed the wrong month.
- View Log button
- When closing Compose window dialogue requesting choice from user is not shown and some options are lost in drafted copy
- Weird logic with the 'Edit filter action' dialog
- Resource leaks; memory corruption