A service reports that your browser is not supported
Description: When loading a service in a tab, an error page warns that your browser is not supported.
Solution: Go to Thunderbird Preferences, view the Advanced preferences, and click General. At the bottom of the Advanced > General tab, click “Config Editor” and agree to the disclaimer about voiding your warranty. Search for the configuration setting named “general.useragent.compatMode.firefox” and changed it from it’s default value of “false” to “true” by double clicking the setting’s line. By changing this setting to true, Thunderbird reports its user agent as Firefox to any websites you visit allowing you to view most pages Firefox can.
Gmail outbound links open in blank tab
Description: When a link is clicked from within an email being viewed in a Gmail tab, a blank window is opened but the link is never displayed.
Solution: Right click the link and select “Open Link In Browser”.