diff --git a/python/tidy/servo_tidy/tidy.py b/python/tidy/servo_tidy/tidy.py
index 1dcbd4896d1..a8e53d7804e 100644
--- a/python/tidy/servo_tidy/tidy.py
+++ b/python/tidy/servo_tidy/tidy.py
@@ -782,8 +782,8 @@ def collect_errors_for_files(files_to_check, checking_functions, line_checking_f
                     yield (filename,) + error
 
 
-def get_wpt_files(only_changed_files, progress):
-    wpt_dir = os.path.join(".", "tests", "wpt" + os.sep)
+def get_wpt_files(suite, only_changed_files, progress):
+    wpt_dir = os.path.join(".", "tests", "wpt", suite, "")
     file_iter = get_file_list(os.path.join(wpt_dir), only_changed_files)
     (has_element, file_iter) = is_iter_empty(file_iter)
     if not has_element:
@@ -796,12 +796,13 @@ def get_wpt_files(only_changed_files, progress):
             yield f[len(wpt_dir):]
 
 
-def check_wpt_lint_errors(files):
+def check_wpt_lint_errors(suite, files):
     wpt_working_dir = os.path.abspath(os.path.join(".", "tests", "wpt", "web-platform-tests"))
     if os.path.isdir(wpt_working_dir):
         site.addsitedir(wpt_working_dir)
         from tools.lint import lint
-        returncode = lint.lint(wpt_working_dir, files, output_json=False)
+        file_dir = os.path.abspath(os.path.join(".", "tests", "wpt", suite))
+        returncode = lint.lint(file_dir, files, output_json=False)
         if returncode:
             yield ("WPT Lint Tool", "", "lint error(s) in Web Platform Tests: exit status {0}".format(returncode))
 
@@ -865,9 +866,12 @@ def scan(only_changed_files=False, progress=True):
     # check dependecy licenses
     dep_license_errors = check_dep_license_errors(get_dep_toml_files(only_changed_files), progress)
     # wpt lint checks
-    wpt_lint_errors = check_wpt_lint_errors(get_wpt_files(only_changed_files, progress))
+    wpt_lint_errors = [
+        check_wpt_lint_errors(suite, get_wpt_files(suite, only_changed_files, progress))
+        for suite in ["web-platform-tests", os.path.join("mozilla", "tests")]
+    ]
     # chain all the iterators
-    errors = itertools.chain(config_errors, directory_errors, file_errors, dep_license_errors, wpt_lint_errors)
+    errors = itertools.chain(config_errors, directory_errors, file_errors, dep_license_errors, *wpt_lint_errors)
 
     error = None
     for error in errors:
diff --git a/tests/wpt/mozilla/tests/lint.whitelist b/tests/wpt/mozilla/tests/lint.whitelist
new file mode 100644
index 00000000000..483e131a143
--- /dev/null
+++ b/tests/wpt/mozilla/tests/lint.whitelist
@@ -0,0 +1,23 @@
+# File containing whiteslist for lint errors
+# Format is:
+# ERROR TYPE:file/name/pattern[:line number]
+# e.g.
+# TRAILING WHITESPACE:example/file.html:128
+# to allow trailing whitespace on example/file.html line 128
+
+# Please don't add anything here, unless it's necessary for the test.
+
+## File types that should never be checked ##
+
+*:*.gif
+*:*.jpeg
+*:*.jpg
+*:*.png
+
+## Legacy errors ##
+
+CONSOLE:*
+OPEN-NO-MODE:*
+PATH LENGTH:*
+PRINT STATEMENT:*
+TRAILING WHITESPACE:*
diff --git a/tests/wpt/web-platform-tests/html/semantics/forms/the-form-element/resources/form-action-url-iframe.html b/tests/wpt/web-platform-tests/html/semantics/forms/the-form-element/resources/form-action-url-iframe.html
index 5d9599b3736..2e700514fcc 100644
--- a/tests/wpt/web-platform-tests/html/semantics/forms/the-form-element/resources/form-action-url-iframe.html
+++ b/tests/wpt/web-platform-tests/html/semantics/forms/the-form-element/resources/form-action-url-iframe.html
@@ -2,7 +2,7 @@
 <base href="target/"></base>
 
 <form action="form-action-url-target.html">
-  <input type="submit" value="Submit" /> 
+  <input type="submit" value="Submit" />
 </form>
 
 <script>
diff --git a/tests/wpt/web-platform-tests/tools/lint/lint.py b/tests/wpt/web-platform-tests/tools/lint/lint.py
index 2aee3da1c52..b05cfacfefc 100644
--- a/tests/wpt/web-platform-tests/tools/lint/lint.py
+++ b/tests/wpt/web-platform-tests/tools/lint/lint.py
@@ -42,7 +42,7 @@ def all_git_paths(repo_root):
 
 def check_path_length(repo_root, path):
     if len(path) + 1 > 150:
-        return [("PATH LENGTH", "/%s longer than maximum path length (%d > 150)" % (path, len(path) + 1), None)]
+        return [("PATH LENGTH", "/%s longer than maximum path length (%d > 150)" % (path, len(path) + 1), path, None)]
     return []