--- a/accessible/tests/browser/.eslintrc.js
+++ b/accessible/tests/browser/.eslintrc.js
@@ -65,16 +65,17 @@ module.exports = { // eslint-disable-lin
     "complexity": ["error", 35],
     "consistent-this": "off",
     "curly": ["error", "multi-line"],
     "default-case": "off",
     "dot-location": ["error", "property"],
     "dot-notation": "error",
     "eol-last": "error",
     "eqeqeq": "off",
+    "func-call-spacing": "error",
     "func-names": "off",
     "func-style": "off",
     "generator-star": "off",
     "global-strict": "off",
     "handle-callback-err": ["error", "er"],
     "indent": ["error", 2, {"SwitchCase": 1}],
     "key-spacing": ["error", {"beforeColon": false, "afterColon": true}],
     "linebreak-style": "off",
@@ -136,17 +137,16 @@ module.exports = { // eslint-disable-lin
     "no-restricted-modules": "off",
     "no-return-assign": "error",
     "no-script-url": "off",
     "no-self-compare": "error",
     "no-sequences": "error",
     "no-shadow": "error",
     "no-shadow-restricted-names": "error",
     "no-space-before-semi": "off",
-    "no-spaced-func": "error",
     "no-sparse-arrays": "error",
     "no-sync": "off",
     "no-ternary": "off",
     "no-throw-literal": "error",
     "no-trailing-spaces": "error",
     "no-undef": "error",
     "no-underscore-dangle": "off",
     "no-undefined": "off",

--- a/browser/.eslintrc.js
+++ b/browser/.eslintrc.js
@@ -12,19 +12,16 @@ module.exports = {
 
     // Disallow empty statements. This will report an error for:
     // try { something(); } catch (e) {}
     // but will not report it for:
     // try { something(); } catch (e) { /* Silencing the error because ...*/ }
     // which is a valid use case.
     "no-empty": "error",
 
-    // No spaces between function name and parentheses
-    "no-spaced-func": "error",
-
     // Maximum depth callbacks can be nested.
     "max-nested-callbacks": ["error", 8],
 
     // Disallow adding to native types
     "no-extend-native": "error",
 
     "no-mixed-spaces-and-tabs": "error",
     "no-shadow": "error",

--- a/security/manager/.eslintrc.js
+++ b/security/manager/.eslintrc.js
@@ -24,19 +24,16 @@ module.exports = {
     "default-case": "error",
 
     // Require `foo.bar` dot notation instead of `foo["bar"]` notation.
     "dot-notation": "error",
 
     // Always require a trailing EOL
     "eol-last": "error",
 
-    // No spaces between function name and parentheses.
-    "func-call-spacing": ["error", "never"],
-
     // Require function* name()
     "generator-star-spacing": ["error", {"before": false, "after": true}],
 
     // Space after colon not before in property declarations
     "key-spacing": ["error", { "beforeColon": false, "afterColon": true, "mode": "minimum" }],
 
     // Always require parenthesis for new calls
     "new-parens": "error",

--- a/toolkit/components/extensions/.eslintrc.js
+++ b/toolkit/components/extensions/.eslintrc.js
@@ -97,19 +97,16 @@ module.exports = {
     // No mixing different operators without parens
     "no-mixed-operators": ["error", {"groups": [["&&", "||"], ["==", "!=", "===", "!==", ">", ">=", "<", "<="], ["in", "instanceof"]]}],
 
     // Disallow use of multiple spaces (sometimes used to align const values,
     // array or object items, etc.). It's hard to maintain and doesn't add that
     // much benefit.
     "no-multi-spaces": "warn",
 
-    // No spaces between function name and parentheses
-    "no-spaced-func": "warn",
-
     // No expressions where a statement is expected
     "no-unused-expressions": "error",
 
     // No declaring variables that are never used
     "no-unused-vars": ["error", {"args": "none", "varsIgnorePattern": "^(Cc|Ci|Cr|Cu|EXPORTED_SYMBOLS)$"}],
 
     // No using variables before defined
     "no-use-before-define": "error",

--- a/toolkit/components/narrate/.eslintrc.js
+++ b/toolkit/components/narrate/.eslintrc.js
@@ -63,17 +63,16 @@ module.exports = {
     "no-native-reassign": "error",
     "no-nested-ternary": "error",
     "no-redeclare": "error",
     "no-return-assign": "error",
     "no-self-compare": "error",
     "no-sequences": "error",
     "no-shadow": "warn",
     "no-shadow-restricted-names": "error",
-    "no-spaced-func": "warn",
     "no-throw-literal": "error",
     "no-trailing-spaces": "error",
     "no-undef": "error",
     "no-unneeded-ternary": "error",
     "no-unreachable": "error",
     "no-unused-vars": "error",
     "no-with": "error",
     "padded-blocks": ["warn", "never"],

--- a/toolkit/components/reader/.eslintrc.js
+++ b/toolkit/components/reader/.eslintrc.js
@@ -128,19 +128,16 @@ module.exports = {
     "no-self-compare": "error",
 
     // No declaring variables from an outer scope
     "no-shadow": "error",
 
     // No declaring variables that hide things like arguments
     "no-shadow-restricted-names": "error",
 
-    // No spaces between function name and parentheses
-    "no-spaced-func": "error",
-
     // No trailing whitespace
     "no-trailing-spaces": "error",
 
     // No using undeclared variables
     // "no-undef": "error",
 
     // Error on newline where a semicolon is needed
     "no-unexpected-multiline": "error",