From MozillaZine Knowledge Base

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1. About:config entries (671 revisions)
2. Knowledge Base changes (529 revisions)
3. Problematic extensions (353 revisions)
4. Knowledge Base (343 revisions)
5. Flash (319 revisions)
6. Issues with Firefox (278 revisions)
7. Java (277 revisions)
8. Pages voted for deletion (261 revisions)
9. Firefox Materials (237 revisions)
10. Firefox FAQs (233 revisions)
11. Firefox hangs (231 revisions)
12. Thunderbird : FAQs (228 revisions)
13. Profile Folder (220 revisions)
14. Lost bookmarks (214 revisions)
15. Firefox crashes (212 revisions)
16. Standard diagnostic - Firefox (200 revisions)
17. Browser will not start up (196 revisions)
18. Windows Media Player (173 revisions)
19. Compacting folders (169 revisions)
20. Product comparison matrix (166 revisions)
21. Unable to save or download files (164 revisions)
22. Antivirus software (164 revisions)
23. Uninstalling add-ons (156 revisions)
24. Error loading websites (154 revisions)
25. Profile folder (150 revisions)
26. Firewalls (142 revisions)
27. Firefox tips (139 revisions)
28. Software Update (137 revisions)
29. Profile Manager (136 revisions)
30. Importing and exporting your mail (133 revisions)
31. Adobe Reader (132 revisions)
32. Safe Mode (128 revisions)
33. Moving your profile folder (127 revisions)
34. Thunderbird 3.0 - New Features and Changes (126 revisions)
35. Sandbox (125 revisions)
36. Mozilla Suite and SeaMonkey FAQs (122 revisions)
37. Default browser (122 revisions)
38. Mail and news settings (119 revisions)
39. Junk Mail Controls (115 revisions)
40. File types and download actions (112 revisions)
41. Profile in use (111 revisions)
42. Sorting and rearranging bookmarks - Firefox (109 revisions)
43. Profile folder - Firefox (109 revisions)
44. Unable to install themes or extensions (108 revisions)
45. Gmail (107 revisions)
46. Using webmail with your email client (106 revisions)
47. PalmSync - Thunderbird (101 revisions)
48. Testing plugins (101 revisions)
49. Websites look wrong (101 revisions)
50. Mozilla Crash Reporter (99 revisions)

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