--- a/devtools/client/locales/en-US/responsive.properties
+++ b/devtools/client/locales/en-US/responsive.properties
@@ -18,17 +18,17 @@ responsive.editDeviceList=Edit list…
 # LOCALIZATION NOTE (responsive.exit): tooltip text of the exit button.
 responsive.exit=Close Responsive Design Mode
 
 # LOCALIZATION NOTE (responsive.deviceListLoading): placeholder text for
 # device selector when it's still fetching devices
 responsive.deviceListLoading=Loading…
 
 # LOCALIZATION NOTE (responsive.deviceListError): placeholder text for
-# device selector when an error occured
+# device selector when an error occurred
 responsive.deviceListError=No list available
 
 # LOCALIZATION NOTE (responsive.done): button text in the device list modal
 responsive.done=Done
 
 # LOCALIZATION NOTE (responsive.noDeviceSelected): placeholder text for the
 # device selector
 responsive.noDeviceSelected=no device selected

--- a/devtools/shared/locales/en-US/gclicommands.properties
+++ b/devtools/shared/locales/en-US/gclicommands.properties
@@ -1452,17 +1452,17 @@ folderInvalidPath=Please enter a valid p
 # describe the result of the 'folder open' command.
 # The argument (%1$S) is the folder path.
 folderOpenDirResult=Opened %1$S
 
 # LOCALIZATION NOTE (mdnDesc) A very short string used to describe the
 # use of 'mdn' command.
 mdnDesc=Retrieve documentation from MDN
 # LOCALIZATION NOTE (mdnCssDesc) A very short string used to describe the
-# result of the 'mdn css' commmand.
+# result of the 'mdn css' command.
 mdnCssDesc=Retrieve documentation about a given CSS property name from MDN
 # LOCALIZATION NOTE (mdnCssProp) String used to describe the 'property name'
 # parameter used in the 'mdn css' command.
 mdnCssProp=Property name
 # LOCALIZATION NOTE (mdnCssPropertyNotFound) String used to display an error in
 # the result of the 'mdn css' command. Errors occur when a given CSS property
 # wasn't found on MDN. The %1$S parameter will be replaced with the name of the
 # CSS property.

--- a/dom/locales/en-US/chrome/dom/dom.properties
+++ b/dom/locales/en-US/chrome/dom/dom.properties
@@ -92,17 +92,17 @@ InvalidRedirectChannelWarning=Unable to redirect to %S because the channel doesn’t implement nsIWritablePropertyBag2.
 ResponseTypeSyncXHRWarning=Use of XMLHttpRequest’s responseType attribute is no longer supported in the synchronous mode in window context.
 TimeoutSyncXHRWarning=Use of XMLHttpRequest’s timeout attribute is not supported in the synchronous mode in window context.
 JSONCharsetWarning=An attempt was made to declare a non-UTF-8 encoding for JSON retrieved using XMLHttpRequest. Only UTF-8 is supported for decoding JSON.
 # LOCALIZATION NOTE: Do not translate AudioBufferSourceNode
 MediaBufferSourceNodeResampleOutOfMemory=Insufficient memory to resample the AudioBufferSourceNode for playback.
 # LOCALIZATION NOTE: Do not translate decodeAudioData.
 MediaDecodeAudioDataUnknownContentType=The buffer passed to decodeAudioData contains an unknown content type.
 # LOCALIZATION NOTE: Do not translate decodeAudioData.
-MediaDecodeAudioDataUnknownError=An unknown error occured while processing decodeAudioData.
+MediaDecodeAudioDataUnknownError=An unknown error occurred while processing decodeAudioData.
 # LOCALIZATION NOTE: Do not translate decodeAudioData.
 MediaDecodeAudioDataInvalidContent=The buffer passed to decodeAudioData contains invalid content which cannot be decoded successfully.
 # LOCALIZATION NOTE: Do not translate decodeAudioData.
 MediaDecodeAudioDataNoAudio=The buffer passed to decodeAudioData does not contain any audio.
 # LOCALIZATION NOTE: Do not translate HTMLMediaElement and createMediaElementSource.
 MediaElementAudioSourceNodeCrossOrigin=The HTMLMediaElement passed to createMediaElementSource has a cross-origin resource, the node will output silence.
 # LOCALIZATION NOTE: Do not translate MediaStream and createMediaStreamSource.
 MediaStreamAudioSourceNodeCrossOrigin=The MediaStream passed to createMediaStreamSource has a cross-origin resource, the node will output silence.

--- a/netwerk/locales/en-US/necko.properties
+++ b/netwerk/locales/en-US/necko.properties
@@ -36,14 +36,14 @@ DirFileLabel=File:
 PhishingAuth=You are about to visit “%1$S”. This site may be attempting to trick you into thinking you are visiting a different site. Use extreme caution.
 PhishingAuthAccept=I understand and will be very careful
 SuperfluousAuth=You are about to log in to the site “%1$S” with the username “%2$S”, but the website does not require authentication. This may be an attempt to trick you.\n\nIs “%1$S” the site you want to visit?
 AutomaticAuth=You are about to log in to the site “%1$S” with the username “%2$S”.
 
 TrackingUriBlocked=The resource at “%1$S” was blocked because tracking protection is enabled.
 
 # LOCALIZATION NOTE (APIDeprecationWarning):
-# %1$S is the deprected API; %2$S is the API function that should be used.
+# %1$S is the deprecated API; %2$S is the API function that should be used.
 APIDeprecationWarning=Warning: ‘%1$S’ deprecated, please use ‘%2$S’
 
 # LOCALIZATION NOTE (nsICookieManagerDeprecated): don't localize originAttributes.
 # %1$S is the deprecated API; %2$S is the interface suffix that the given deprecated API belongs to.
 nsICookieManagerAPIDeprecated=“%1$S” is changed. Update your code and pass the correct originAttributes. Read more on MDN: https://developer.mozilla.org/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsICookieManager%2$S

--- a/toolkit/locales/en-US/chrome/global/filepicker.properties
+++ b/toolkit/locales/en-US/chrome/global/filepicker.properties
@@ -47,9 +47,9 @@ errorCreateNewDirTitle=Error creating %S
 errorCreateNewDirMessage=Directory %S could not be created
 errorCreateNewDirIsFileMessage=Directory cannot be created, %S is a file
 errorCreateNewDirPermissionMessage=Directory cannot be created, %S not writable
 
 promptNewDirTitle=Create new directory
 promptNewDirMessage=Directory name:
 
 errorPathProblemTitle=Unknown Error
-errorPathProblemMessage=An unknown error occured (path %S)
+errorPathProblemMessage=An unknown error occurred (path %S)