--- a/toolkit/components/telemetry/Histograms.json
+++ b/toolkit/components/telemetry/Histograms.json
@@ -5084,196 +5084,196 @@
   "FX_THUMBNAILS_HIT_OR_MISS": {
     "expires_in_version": "never",
     "kind": "boolean",
     "description": "THUMBNAILS: Thumbnail found"
   },
   "FX_MIGRATION_ENTRY_POINT": {
     "bug_numbers": [731025],
     "alert_emails": ["gijs@mozilla.com"],
-    "expires_in_version": "53",
+    "expires_in_version": "57",
     "kind": "enumerated",
     "n_values": 10,
     "releaseChannelCollection": "opt-out",
     "description": "Where the migration wizard was entered from. 0=Other/catch-all, 1=first-run, 2=refresh-firefox, 3=Places window, 4=Password manager"
   },
   "FX_MIGRATION_SOURCE_BROWSER": {
     "bug_numbers": [731025],
     "alert_emails": ["gijs@mozilla.com"],
-    "expires_in_version": "53",
+    "expires_in_version": "57",
     "kind": "enumerated",
     "n_values": 15,
     "releaseChannelCollection": "opt-out",
     "description": "The browser that data is pulled from. The values correspond to the internal browser ID (see MigrationUtils.jsm)"
   },
   "FX_MIGRATION_ERRORS": {
     "bug_numbers": [731025],
     "alert_emails": ["gijs@mozilla.com"],
-    "expires_in_version": "53",
+    "expires_in_version": "57",
     "kind": "enumerated",
     "keyed": true,
     "n_values": 12,
     "releaseChannelCollection": "opt-out",
     "description": "Errors encountered during migration in buckets defined by the datatype, keyed by the string description of the browser."
   },
   "FX_MIGRATION_USAGE": {
     "bug_numbers": [731025],
     "alert_emails": ["gijs@mozilla.com"],
-    "expires_in_version": "53",
+    "expires_in_version": "57",
     "kind": "enumerated",
     "keyed": true,
     "n_values": 12,
     "releaseChannelCollection": "opt-out",
     "description": "Usage of migration for each datatype when migration is run through the post-firstrun flow which allows individual datatypes, keyed by the string description of the browser."
   },
   "FX_MIGRATION_IMPORTED_HOMEPAGE": {
     "bug_numbers": [731025, 1298208],
     "alert_emails": ["gijs@mozilla.com"],
-    "expires_in_version": "53",
+    "expires_in_version": "57",
     "kind": "boolean",
     "keyed": true,
     "releaseChannelCollection": "opt-out",
     "description": "Whether the homepage was imported during browser migration. Only available on release builds during firstrun."
   },
   "FX_MIGRATION_BOOKMARKS_IMPORT_MS": {
     "bug_numbers": [1289436],
     "alert_emails": ["gijs@mozilla.com"],
-    "expires_in_version": "54",
+    "expires_in_version": "57",
     "kind": "exponential",
     "n_buckets": 70,
     "high": 100000,
     "releaseChannelCollection": "opt-out",
     "keyed": true,
     "description": "How long it took to import bookmarks from another browser, keyed by the name of the browser."
   },
   "FX_MIGRATION_HISTORY_IMPORT_MS": {
     "bug_numbers": [1289436],
     "alert_emails": ["gijs@mozilla.com"],
-    "expires_in_version": "54",
+    "expires_in_version": "57",
     "kind": "exponential",
     "n_buckets": 70,
     "high": 100000,
     "releaseChannelCollection": "opt-out",
     "keyed": true,
     "description": "How long it took to import history from another browser, keyed by the name of the browser."
   },
   "FX_MIGRATION_LOGINS_IMPORT_MS": {
     "bug_numbers": [1289436],
     "alert_emails": ["gijs@mozilla.com"],
-    "expires_in_version": "54",
+    "expires_in_version": "57",
     "kind": "exponential",
     "n_buckets": 70,
     "high": 100000,
     "releaseChannelCollection": "opt-out",
     "keyed": true,
     "description": "How long it took to import logins (passwords) from another browser, keyed by the name of the browser."
   },
   "FX_MIGRATION_BOOKMARKS_QUANTITY": {
     "bug_numbers": [1279501],
     "alert_emails": ["gijs@mozilla.com"],
-    "expires_in_version": "56",
+    "expires_in_version": "57",
     "kind": "exponential",
     "n_buckets": 20,
     "high": 1000,
     "releaseChannelCollection": "opt-out",
     "keyed": true,
     "description": "How many bookmarks we imported from another browser, keyed by the name of the browser."
   },
   "FX_MIGRATION_HISTORY_QUANTITY": {
     "bug_numbers": [1279501],
     "alert_emails": ["gijs@mozilla.com"],
-    "expires_in_version": "56",
+    "expires_in_version": "57",
     "kind": "exponential",
     "n_buckets": 40,
     "high": 10000,
     "releaseChannelCollection": "opt-out",
     "keyed": true,
     "description": "How many history visits we imported from another browser, keyed by the name of the browser."
   },
   "FX_MIGRATION_LOGINS_QUANTITY": {
     "bug_numbers": [1279501],
     "alert_emails": ["gijs@mozilla.com"],
-    "expires_in_version": "56",
+    "expires_in_version": "57",
     "kind": "exponential",
     "n_buckets": 20,
     "high": 1000,
     "releaseChannelCollection": "opt-out",
     "keyed": true,
     "description": "How many logins (passwords) we imported from another browser, keyed by the name of the browser."
   },
   "FX_STARTUP_MIGRATION_BROWSER_COUNT": {
     "bug_numbers": [1275114],
     "alert_emails": ["gijs@mozilla.com"],
-    "expires_in_version": "53",
+    "expires_in_version": "57",
     "kind": "enumerated",
     "n_values": 15,
     "releaseChannelCollection": "opt-out",
     "description": "Number of browsers from which the user could migrate on initial profile migration. Only available on release builds during firstrun."
   },
   "FX_STARTUP_MIGRATION_EXISTING_DEFAULT_BROWSER": {
     "bug_numbers": [1275114],
     "alert_emails": ["gijs@mozilla.com"],
-    "expires_in_version": "53",
+    "expires_in_version": "57",
     "kind": "enumerated",
     "n_values": 15,
     "releaseChannelCollection": "opt-out",
     "description": "The browser that was the default on the initial profile migration. The values correspond to the internal browser ID (see MigrationUtils.jsm)"
   },
   "FX_STARTUP_MIGRATION_AUTOMATED_IMPORT_PROCESS_SUCCESS": {
     "bug_numbers": [1271775],
     "alert_emails": ["gijs@mozilla.com"],
-    "expires_in_version": "53",
+    "expires_in_version": "57",
     "kind": "enumerated",
     "n_values": 27,
     "releaseChannelCollection": "opt-out",
     "description": "Where automatic migration was attempted, indicates to what degree we succeeded. Values 0-25 indicate progress through the automatic migration sequence, with 25 indicating the migration finished. 26 is only used when the migration produced errors before it finished."
   },
   "FX_STARTUP_MIGRATION_AUTOMATED_IMPORT_UNDO": {
     "bug_numbers": [1283565],
     "alert_emails": ["gijs@mozilla.com"],
-    "expires_in_version": "53",
+    "expires_in_version": "57",
     "kind": "enumerated",
     "n_values": 31,
     "releaseChannelCollection": "opt-out",
     "description": "Where undo of the automatic migration was attempted, indicates to what degree we succeeded to undo. 0 means we started to undo, 5 means we bailed out from the undo because it was not possible to complete it (there was nothing to undo or the user was signed in to sync). All higher values indicate progression through the undo sequence, with 30 indicating we finished the undo without exceptions in the middle."
   },
   "FX_STARTUP_MIGRATION_UNDO_REASON": {
     "bug_numbers": [1289906],
     "alert_emails": ["gijs@mozilla.com"],
-    "expires_in_version": "54",
+    "expires_in_version": "57",
     "keyed": true,
     "kind": "enumerated",
     "n_values": 10,
     "releaseChannelCollection": "opt-out",
     "description": "Why the undo functionality of an automatic migration was disabled: 0 means we used undo, 1 means the user signed in to sync, 2 means the user created/modified a password, 3 means the user created/modified a bookmark (item or folder), 4 means we showed an undo option repeatedly and the user did not use it, 5 means we showed an undo option and the user actively elected to keep the data. The whole thing is keyed to the identifiers of different browsers (so 'chrome', 'ie', 'edge', 'safari', etc.)."
   },
   "FX_STARTUP_MIGRATION_UNDO_OFFERED": {
     "bug_numbers": [1309617],
     "alert_emails": ["gijs@mozilla.com"],
-    "expires_in_version": "56",
+    "expires_in_version": "57",
     "kind": "enumerated",
     "n_values": 5,
     "releaseChannelCollection": "opt-out",
     "description": "Indicates we showed a 'would you like to undo this automatic migration?' notification bar. The bucket indicates which nth day we're on (1st/2nd/3rd, by default - 0 would be indicative the pref didn't get set which shouldn't happen). After 3 days on which the notification gets shown, it will get disabled and never shown again."
   },
   "FX_STARTUP_MIGRATION_DATA_RECENCY": {
     "bug_numbers": [1276694],
     "alert_emails": ["gijs@mozilla.com"],
-    "expires_in_version": "53",
+    "expires_in_version": "57",
     "keyed": true,
     "kind": "exponential",
     "n_buckets": 50,
     "high": 8760,
     "releaseChannelCollection": "opt-out",
     "description": "The 'last modified' time of the data we imported on the initial profile migration (time delta with 'now' at the time of migration, in hours). Collected for all browsers for which migration data is available, and stored keyed by browser identifier (e.g. 'ie', 'edge', 'safari', etc.)."
   },
   "FX_STARTUP_MIGRATION_USED_RECENT_BROWSER": {
     "bug_numbers": [1276694],
     "alert_emails": ["gijs@mozilla.com"],
-    "expires_in_version": "53",
+    "expires_in_version": "57",
     "keyed": true,
     "kind": "boolean",
     "releaseChannelCollection": "opt-out",
     "description": "Whether the browser we migrated from was the browser with the most recent data. Keyed by that browser's identifier (e.g. 'ie', 'edge', 'safari', etc.)."
   },
   "FX_PREFERENCES_CATEGORY_OPENED": {
     "bug_numbers": [1324167],
     "alert_emails": ["jaws@mozilla.com"],