Thunderbird Configuration

Change text size for user interface and e-mails

  1. Start Mozilla Thunderbird.
  2. Press the ‘Alt’ key.
  3. A menu bar will appear at the top of Thunderbird’s main window.
  4. Click ‘Tools’ on the menu bar.
  5. A drop-down menu will appear.
  6. Click ‘Options’ at the bottom of the drop-down menu.
  7. An ‘Options’ tab will appear.
  8. On the left-hand pane of the new tab, click the cog icon next to the word ‘General’.
  9. The right-hand pane of the new tab will then show all the ‘General’ options.
  10. Scroll to the bottom of all the ‘General’ options.
  11. Click the ‘Config Editor...’ button.
  12. A pop-up window will appear warning you that using the configuration editor can cause problems.
  13. Click the button saying 'I accept the risk!'
  14. The configuration editor window will appear.
  15. In the search box, type ‘layout.css.devPixelsPerPx’.
  16. In the 'Preference Name' column, double-click ‘layout.css.devPixelsPerPx’.
  17. A small ‘Enter string value’ box will appear
  18. Type in the required value, with larger numbers making the global text size larger.
  19. Click the ‘OK’ button.
  20. Click the ‘X’ at the top-right of the configuration editor window.
  21. The configuration editor window will close.
  22. Click the ‘X’ at the top of the options tab.
  23. The options tab will close.
  24. Close Mozilla Thunderbird when you are finished.