Beta 2

Changes from Beta 1:

• Add back legacy Password Manager - very buggy!
• Re-add Certificate Manager support
• Replace about: pages theme with the classic Firefox Strata theme
• Add new settings to both pref system panes
• Replace outdated .xul file references with .xhtml in preference panes
• Fix issues with native version of not rendering properly
• Add legacy platform-specific icons back to codebase
• Fix legacy confirm close dialog
• Accuracy fixes to Page Info window
• Add LibreWolf and Skyfox tabs to legacy prefs window, and improve UI accuracy
• Restore in XUL as a thin wrapper around moz-input-box and the HTML text box