diff --git a/README.md b/README.md
index 824fa688bf2..a1b700536a1 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ In order to be able to build Thunderbird - you will need the mozilla-central rep
 
 ### mozilla-central vs. comm-central
 
-The mozilla-central repostitory contains the Firefox codebase and all of the platform code. The comm-central repository is added as a subdirectory "comm/" under mozilla-central. This contains the code for Thunderbird.
+The mozilla-central repository contains the Firefox codebase and all of the platform code. The comm-central repository is added as a subdirectory "comm/" under mozilla-central. This contains the code for Thunderbird.
 
 ## Building Thunderbird
 
@@ -94,7 +94,7 @@ or to do it via one command:
 hg pull -u && cd comm && hg pull -u
 ```
 
-The just run the `./mach build` command detailed in the [Building](./#building)instructions above. This will only recompile files that changed, but it may still take a long time.
+The just run the `./mach build` command detailed in the [Building](./#building) instructions above. This will only recompile files that changed, but it may still take a long time.
 
 ## Rebuilding
 
diff --git a/chat/protocols/matrix/lib/README.md b/chat/protocols/matrix/lib/README.md
index c70ef1a6b9c..c84c13deb92 100644
--- a/chat/protocols/matrix/lib/README.md
+++ b/chat/protocols/matrix/lib/README.md
@@ -88,5 +88,5 @@ currently integrated is the "full browser" distribution. It can be found under:
 
 ### Updating unhomoglyph
 
-This is simlar to the single file dependencies, but also has a JSON data file.
+This is similar to the single file dependencies, but also has a JSON data file.
 Both of these files should be copied to the unhomoglyph directory.
diff --git a/mail/extensions/openpgp/README.md b/mail/extensions/openpgp/README.md
index 5e7ae35fe22..9560a953ac9 100644
--- a/mail/extensions/openpgp/README.md
+++ b/mail/extensions/openpgp/README.md
@@ -17,6 +17,6 @@ which is based on an initial import of Enigmail Add-on code.
   Kai Engert, Patrick Brunschwig, Magnus Melin
 
 - Prior to enabling this code, all code must be enabled for
-  eslint and must be fully reviewd, as tracked in:
+  eslint and must be fully reviewed, as tracked in:
   - https://bugzilla.mozilla.org/show_bug.cgi?id=1595319
   - https://bugzilla.mozilla.org/show_bug.cgi?id=1595325