If Firefox is uninstalled and not working please get a copy of your Profile :

• https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data

If it is running please get these this way :

• https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer
• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

Please Copy/Paste about:support and go all the way down to the bottom to Places Database and Click on Verify Integrity. Post the results please.

Thanks Pkshadow.

Here is the result of the Verify Integrity. I'm not sure how to post a copy of my Profile. I can't zip the folder into a single file because it contains some read-only files.

> Task: checkIntegrity + The places.sqlite database is sane + The favicons.sqlite database is sane > Task: invalidateCaches + The caches have been invalidated > Task: checkCoherence + The database is coherent > Task: expire + Database cleaned up > Task: originFrecencyStats + Recalculated origin frecency stats > Task: vacuum + Initial database size is 5120KiB + The database has been vacuumed + Final database size is 5120KiB > Task: stats + Places.sqlite size is 5120KiB + Favicons.sqlite size is 5120KiB + pragma_user_version is 52 + pragma_page_size is 32768 + pragma_cache_size is -2048 + pragma_journal_mode is wal + pragma_synchronous is 1 + History can store a maximum of 64941 unique pages + Table moz_places has 2043 records + Table moz_historyvisits has 3592 records + Table moz_inputhistory has 0 records + Table moz_hosts has 0 records + Table moz_bookmarks has 33 records + Table moz_bookmarks_deleted has 0 records + Table moz_keywords has 0 records + Table sqlite_sequence has 0 records + Table moz_anno_attributes has 4 records + Table moz_annos has 149 records + Table moz_items_annos has 2 records + Table moz_meta has 5 records + Table sqlite_stat1 has 17 records + Table moz_origins has 325 records + Index sqlite_autoindex_moz_inputhistory_1 + Index sqlite_autoindex_moz_hosts_1 + Index sqlite_autoindex_moz_bookmarks_deleted_1 + Index sqlite_autoindex_moz_keywords_1 + Index sqlite_autoindex_moz_anno_attributes_1 + Index sqlite_autoindex_moz_origins_1 + Index moz_places_url_hashindex + Index moz_places_hostindex + Index moz_places_visitcount + Index moz_places_frecencyindex + Index moz_places_lastvisitdateindex + Index moz_places_guid_uniqueindex + Index moz_historyvisits_placedateindex + Index moz_historyvisits_fromindex + Index moz_historyvisits_dateindex + Index moz_bookmarks_itemindex + Index moz_bookmarks_parentindex + Index moz_bookmarks_itemlastmodifiedindex + Index moz_bookmarks_dateaddedindex + Index moz_bookmarks_guid_uniqueindex + Index moz_keywords_placepostdata_uniqueindex + Index moz_annos_placeattributeindex + Index moz_items_annos_itemattributeindex + Index moz_places_originidindex > Task: _refreshUI

So I don't understand this, but when I was following the instructions to try to create a copy of my Profile, the instructions said to close Firefox, which I did. After making a copy of the Profile, I reopened Firefox and all my top sites were back. Any idea why they disappeared and would not come back after several reinstalls and reboots, and then suddenly they came back?

Hi, Great News, yes when you Clicked Verify Integrity it did some work on your Profile in where the bookmarks and history are in : places.sqlite

So got a copy of your Profile. Keep it current so can restore yourself, As well Export your books and if have a online mail account email them to yourself for storage. Keep current also.

So monitor it for a few days and if it works, great.

Thanks so much for your help!

I have this problem. Clicking Verify Profile didn't help. I still can't add Top Sites or Highlights. This just happened with Version 64.

Hi agdr

Do you see messages related to this issue in the Browser Console?

• "3-bar" menu button or Tools -> Web Developer
• https://developer.mozilla.org/en/Tools/Browser_Console

No, I don't see any thing about either Top Sites or Highlights.

No messages related to Places as well?

Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is is causing the problem.

• switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Appearance
• do NOT click the "Refresh Firefox" button on the Safe Mode start window

• https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

I'm a bit confused as to what I'm looking for here, but I'm not able to add Top Sites in Safe Mode.

I did a refresh and I still can't add Top Sites!