https://support.mozilla.org/en-US/kb/changes-toolbars-and-window-sizes-are-not-saved You may have corrupt xulstore.json file.

Close Firefox. Open your file browser to this hidden location:

• Mac: *~/Library/Application Support/Firefox/Profiles
• Linux: *~/.mozilla/firefox/Profiles
• Windows: %AppData%\Mozilla\Firefox\Profiles
• *C:\Users\<user>\AppData\Roaming\Mozilla\Firefox\Profiles
• Windows XP: C:\Documents and Settings\<user>\Application Data \Mozilla\Firefox\Profiles\

Search for the above file. Then rename or delete it. Restart Firefox.

It is possible that there is a problem with the places.sqlite databse and that Firefox creates a new file that causes the Bookmarks Toolbar to be reset.

If you use Sync then best is to disconnect Sync temporarily during troubleshooting.

This can be caused by a problem with the places.sqlite and favicons.sqlite databases in the Firefox profile folder.

• use "Verify Integrity" button on the "Help -> Troubleshooting Information" (about:support) page

If errors are reported with "Verify Integrity", close and restart Firefox or reboot and retry.

If "Verify Integrity" cannot repair places.sqlite, rename/remove all places.sqlite and favicons.sqlite files in the Firefox profile folder with Firefox closed. Firefox will rebuild places.sqlite and restore the bookmarks from a recent JSON backup in the bookmarkbackups folder.

• keep a backup copy of places.sqlite in case a new places.sqlite database has to be created

See also:

• https://support.mozilla.org/en-US/kb/Bookmarks+not+saved#w_fix-the-bookmarks-file
• https://support.mozilla.org/en-US/kb/fix-bookmarks-and-history-will-not-be-functional

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.

• Help -> Troubleshooting Information -> Profile Folder/Directory:
  Windows: Open Folder; Linux: Open Directory; Mac: Show in Finder
• https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data

Thanks, but my problem is not with bookmarks, but with the customization of the toolbar ...

Fred, Thanks, but for what I've been doing the toolbar configuration is not in xulstore.json but in prefs.js under the browser.uiCustomization.state section I will try to make a copy of the prefs. js, and recover, if it happens again ... I'll tell you later!! Thank you again!! it's really ... tiring!

Cor-el,

I checked the integrity and everything seems to be in order ...

> 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 71680KiB + The database has been vacuumed + Final database size is 71680KiB > Task: stats + Places.sqlite size is 71680KiB + Favicons.sqlite size is 119040KiB + pragma_user_version is 54 + 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 136771 unique pages + Table moz_origins has 15056 records + Table moz_places has 126708 records + Table moz_historyvisits has 152131 records + Table moz_inputhistory has 39 records + Table moz_bookmarks has 4524 records + Table moz_bookmarks_deleted has 21 records + Table moz_keywords has 1 records + Table sqlite_sequence has 1 records + Table moz_anno_attributes has 3 records + Table moz_annos has 4822 records + Table moz_items_annos has 0 records + Table moz_meta has 8 records + Table sqlite_stat1 has 19 records + Index sqlite_autoindex_moz_origins_1 + Index sqlite_autoindex_moz_inputhistory_1 + Index sqlite_autoindex_moz_bookmarks_deleted_1 + Index sqlite_autoindex_moz_keywords_1 + Index sqlite_autoindex_moz_anno_attributes_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_places_originidindex + 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 > Task: _refreshUI

Do you still see bookmarks in the Bookmarks Toolbar folder when this happens ?

Fred, Thanks, but for what I've been doing the toolbar configuration is not in xulstore.json but in prefs.js under the browser.uiCustomization.state section

I believe that preference stores changes you make using the Customize function, such as moving icons around. All of that is getting lost every time you close and restart the browser? But no other customized preferences?

At startup, a preference could be overwritten from either a user.js file or an Autoconfig file. These are not included with Firefox and would have been introduced either by you or by third party software.

• How to fix preferences that won't save -- has a section on finding a user.js file in your profile folder
• Customizing Firefox Using AutoConfig -- describes where to look for files in the Firefox program folder (not in your profile folder)

Exactly ... it only loses the customizing of the toolbar ... and sometimes some configuration of the extensions (for example, of SavePageWE) I'm really intrigued .... I searched the internet and found nothing similar ... I reset Firefox, passed antivirus, antimalware ... We will see tomorrow, when I have turned off the computer and reconnected again ... Because in general I open Firefox when starting and I only disconnect when I turn off the computer in the afternoon. Today I discovered prefs.js by chance ... because I was very intrigued myself. And in fact in the prefs.js the Toolbar configuration appears. User.js and Autoconfig were not found in the Profile folder.

Thank you for your help !!

Translated by Google

Exactly ... it only loses the customizing of the toolbar ... and sometimes some configuration of the extensions (for example, of SavePageWE)

Do you use Firefox Sync? Just wondering if that could be a factor.

Emmanuel said

Exactly ... it only loses the customizing of the toolbar ... and sometimes some configuration of the extensions (for example, of SavePageWE)

Do you use Firefox Sync? Just wondering if that could be a factor.

Not currently, because I work on a single PC

News!

Today the same thing happened ... I restored "prefs.js" (I had saved a backup copy) and with that the toolbars appeared more or less ... the extension icons were not visible, and the extensions did not work.

So I closed Firefox and reopened "without extensions" I closed it again and opened it normally. And it worked !!!

Well, it's a precarious solution ... but the only one that has worked so far

What will it be? What will be the bug? I don't know ... I'm just an end user ... I'm not a programmer or an IT technician ...

Could someone who understands give me an indication of how to resolve it definitively? It's an ungrateful bug ...

I think something is removing or replacing your prefs.js file between Firefox sessions. Some clean-up programs watch for Firefox to close and then remove privacy-related data such as cookies and history, but I haven't heard of one that removes or modifies prefs.js.

Yes, truly ... But what program?

what program or what not program... it's the question

gracias for trying to help ... But we are still at ground zero ....

Does anyone else suggest doing anything ...? Is there a way to put a "sensor" to know which program does this? Or what extension?

Today. When turning on the laptop Firefox presents the same error: loss of the customization toolbar ... I restore two files: prefs.js and xulstore.json I open Firefox in safe mode. Close again. I open it again and now the entire customization of toolbar appears. And all extensions preferences (in particular "Save Page WE") Because? Mystery .... secrets of Firefox.

Does anyone have any suggestions?

Thankful!! Happy New Year!!

https://bugzilla.mozilla.org/ Try creating a bug report. Remember to post its number here. See Bugzilla etiquette before commenting in bug reports. https://bugzilla.mozilla.org/page.cgi?id=etiquette.html