Can you elaborate your issue Please. What expansions are you referring to?

Firefox -> Additions-> Expansions

So you lost half of your Extensions? Try for searching them using the search bar that is present on the top right and download them again.

Hope this helps.

I don't know as it occurred, after turning on of the computer they were already disconnected. This way doesn't work after the second restart of Mozilla they again are disconnected

Do u want those extensions or do you want to remove them?

These expansions are necessary to me

If you remember the names of the expansions, you could try re-installing them on the browser. Let me know if that helps

It doesn't work, after installation they work normally but after Mozilla restart they are again disconnected

What extensions are you running?
Please do the following get the list:

• Click the Firefox button at the top left, then click the Help menu and select Troubleshooting Information from the submenu. If you don't have a Firefox button, click the Help menu at the top and select Troubleshooting Information from the menu.

Now, a new tab containing your troubleshooting information should open.

• At the top of the page, you should see a button that says "Copy text to clipboard". Click it.
• Now, go back to your forum post and click inside the reply box. Press Ctrl+V to paste all the information you copied into the forum post.

{

 "application": {
   "name": "Firefox",
   "version": "28.0",
   "userAgent": "Mozilla/5.0 (Windows NT 6.1; rv:28.0) Gecko/20100101 Firefox/28.0",
   "supportURL": "https://support.mozilla.org/1/firefox/28.0/WINNT/ru/"
 },
 "crashes": {
   "submitted": [],
   "pending": 1
 },
 "modifiedPreferences": {
   "accessibility.typeaheadfind.flashBar": 0,
   "browser.cache.disk.capacity": 358400,
   "browser.cache.disk.smart_size.first_run": false,
   "browser.cache.disk.smart_size.use_old_max": false,
   "browser.cache.disk.smart_size_cached_value": 358400,
   "browser.places.smartBookmarksVersion": 6,
   "browser.search.useDBForOrder": "false",
   "browser.sessionstore.restore_on_demand": false,
   "browser.sessionstore.upgradeBackup.latestBuildID": "20140314220517",
   "browser.startup.homepage_override.mstone": "28.0",
   "browser.startup.homepage": "http://www.yandex.by/",
   "browser.startup.homepage_override.buildID": "20140314220517",
   "browser.tabs.warnOnClose": false,
   "dom.w3c_touch_events.expose": false,
   "dom.mozApps.used": true,
   "extensions.lastAppVersion": "28.0",
   "font.internaluseonly.changed": false,
   "general.useragent.extra.sputnik": "sputnik 2.5.3.12",
   "gfx.direct3d.last_used_feature_level_idx": 0,
   "gfx.direct3d.prefer_10_1": true,
   "keyword.URL": "http://www.default-search.net/search?sid=476&aid=114&itype=a&ver=12302&tm=307&src=ds&p=",
   "network.http.proxy.keep-alive": true,
   "network.cookie.prefsMigrated": true,
   "network.http.pipelining.maxrequests": 4,
   "network.http.max-connections-per-server": 15,
   "network.http.keep-alive": true,
   "network.http.connect.timeout": 30,
   "network.dnsCacheEntries": 20,
   "network.http.max-persistent-connections-per-proxy": 8,
   "network.dnsCacheExpiration": 60,
   "places.database.lastMaintenance": 1397401072,
   "places.history.expiration.transient_current_max_pages": 53666,
   "plugin.importedState": true,
   "plugin.state.java": 0,
   "plugin.disable_full_page_plugin_for_types": "application/pdf",
   "privacy.donottrackheader.enabled": true,
   "privacy.sanitize.migrateFx3Prefs": true,
   "security.warn_viewing_mixed": false,
   "storage.vacuum.last.places.sqlite": 1396628204,
   "storage.vacuum.last.index": 1
 },
 "graphics": {
   "numTotalWindows": 1,
   "numAcceleratedWindows": 1,
   "windowLayerManagerType": "Direct3D 10",
   "windowLayerManagerRemote": false,
   "adapterDescription": "NVIDIA GeForce GT 220 ",
   "adapterVendorID": "0x10de",
   "adapterDeviceID": "0x0a20",
   "adapterRAM": "1024",
   "adapterDrivers": "nvd3dum nvwgf2um,nvwgf2um",
   "driverVersion": "9.18.13.3165",
   "driverDate": "10-23-2013",
   "adapterDescription2": "",
   "adapterVendorID2": "",
   "adapterDeviceID2": "",
   "adapterRAM2": "",
   "adapterDrivers2": "",
   "driverVersion2": "",
   "driverDate2": "",
   "isGPU2Active": false,
   "direct2DEnabled": true,
   "directWriteEnabled": true,
   "directWriteVersion": "6.2.9200.16571",
   "webglRenderer": "Google Inc. -- ANGLE (NVIDIA GeForce GT 220  Direct3D9Ex vs_3_0 ps_3_0)",
   "info": {
     "AzureCanvasBackend": "direct2d",
     "AzureSkiaAccelerated": 0,
     "AzureFallbackCanvasBackend": "cairo",
     "AzureContentBackend": "direct2d"
   }
 },
 "javaScript": {
   "incrementalGCEnabled": true
 },
 "accessibility": {
   "isActive": false,
   "forceDisabled": 0
 },
 "libraryVersions": {
   "NSPR": {
     "minVersion": "4.10.3",
     "version": "4.10.3"
   },
   "NSS": {
     "minVersion": "3.15.5 Basic ECC",
     "version": "3.15.5 Basic ECC"
   },
   "NSSUTIL": {
     "minVersion": "3.15.5",
     "version": "3.15.5"
   },
   "NSSSSL": {
     "minVersion": "3.15.5 Basic ECC",
     "version": "3.15.5 Basic ECC"
   },
   "NSSSMIME": {
     "minVersion": "3.15.5 Basic ECC",
     "version": "3.15.5 Basic ECC"
   }
 },
 "userJS": {
   "exists": true
 },
 "extensions": [
   {
     "name": "Adblock Plus",
     "version": "2.5.1",
     "isActive": true,
     "id": "{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}"
   },
   {
     "name": "avast! Online Security",
     "version": "9.0.2011.70",
     "isActive": true,
     "id": "wrc@avast.com"
   },
   {
     "name": "Download YouTube Videos as MP4",
     "version": "1.7.18",
     "isActive": true,
     "id": "{b9bfaf1c-a63f-47cd-8b9a-29526ced9060}"
   },
   {
     "name": "Element Hiding Helper для Adblock Plus",
     "version": "1.2.3",
     "isActive": true,
     "id": "elemhidehelper@adblockplus.org"
   },
   {
     "name": "Flagfox",
     "version": "5.0.1",
     "isActive": true,
     "id": "{1018e4d6-728f-4b20-ad56-37578a4de76b}"
   },
   {
     "name": "Ghostery",
     "version": "5.2.0",
     "isActive": true,
     "id": "firefox@ghostery.com"
   },
   {
     "name": "Block site",
     "version": "1.1.8",
     "isActive": false,
     "id": "{dd3d7613-0246-469d-bc65-2a3cc1668adc}"
   },
   {
     "name": "Desktopy",
     "version": "1.0.2",
     "isActive": false,
     "id": "{71238372-3743-33ab-8a9f-93722af74c97}"
   },
   {
     "name": "DownThemAll!",
     "version": "2.0.16",
     "isActive": false,
     "id": "{DDC359D1-844A-42a7-9AA1-88A850A938A8}"
   },
   {
     "name": "FastestFox",
     "version": "5.2.1",
     "isActive": false,
     "id": "smarterwiki@wikiatic.com"
   },
   {
     "name": "Media View",
     "version": "1.1",
     "isActive": false,
     "id": "ext@MediaViewV1alpha1312.net"
   },
   {
     "name": "Media Watch",
     "version": "1.1",
     "isActive": false,
     "id": "ext@MediaWatchV1home499.net"
   },
   {
     "name": "Saved Password Editor",
     "version": "2.7.2",
     "isActive": false,
     "id": "savedpasswordeditor@daniel.dawson"
   },
   {
     "name": "Settings Manager",
     "version": "5.0.0.12302",
     "isActive": false,
     "id": "{1ED03F15-1006-1C66-CCA5-15A00B80A7B7}"
   },
   {
     "name": "Skype Click to Call",
     "version": "7.0.14735.1561",
     "isActive": false,
     "id": "{82AF8DCA-6DE9-405D-BD5E-43525BDAD38A}"
   },
   {
     "name": "Super Start",
     "version": "7.0",
     "isActive": false,
     "id": "superstart@enjoyfreeware.org"
   },
   {
     "name": "Tab Scope",
     "version": "1.5",
     "isActive": false,
     "id": "tabscope@xuldev.org"
   },
   {
     "name": "Tile Tabs",
     "version": "11.5",
     "isActive": false,
     "id": "tiletabs@DW-dev"
   },
   {
     "name": "VKontakte.ru MP3 Музыка Качалка",
     "version": "2.2",
     "isActive": false,
     "id": "ffvkontaktemusic@chupakabr.ru"
   },
   {
     "name": "WOT",
     "version": "20131118",
     "isActive": false,
     "id": "{a0d7ccb3-214d-498b-b4aa-0e8fda9a7bf7}"
   },
   {
     "name": "ВКонтакте.ру Downloader",
     "version": "0.3.7.0",
     "isActive": false,
     "id": "vk@sergeykolosov.mp"
   }
 ]

}

It is possible that there is a problem with the file(s) that store the extensions registry.

Delete the extensions.* files (e.g. extensions.json, extensions.sqlite, extensions.ini) and compatibility.ini in the Firefox profile folder to reset the extensions registry.

• https://support.mozilla.org/kb/Profiles

New files will be created when required.

See "Corrupt extension files":

• http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
• https://support.mozilla.org/kb/Unable+to+install+add-ons

If you see disabled or not compatible extensions in "Firefox/Tools > Add-ons > Extensions" then click the Tools button at the left end of the Search bar to check if there is a compatibility update available.

If this hasn't helped then also delete possible addons.json and addons.sqlite files.

I something can't find these files. Tell please where precisely there are these files

You can use this button to go to the currently used Firefox profile folder:

• Help > Troubleshooting Information > Profile Director: Show Folder (Linux: Open Director; Mac: Show in Finder)

• http://kb.mozillazine.org/Profile_folder_-_Firefox

It doesn't help, I even did Firefox dumping everything exactly after the second restart expansion is disconnected (

Only those expansions which don't demand restart after installation work

You can also check for problems with preferences.

Delete a possible user.js file and numbered prefs-##.js files and rename (or delete) the prefs.js file to reset all prefs to the default value including prefs set via user.js and prefs that are no longer supported in the current Firefox release.

• http://kb.mozillazine.org/Preferences_not_saved
• http://kb.mozillazine.org/Resetting_preferences

Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as a test to see if this helps.

• http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/

doesn't help