diff --git a/api/SVGAnimatedAngle.json b/api/SVGAnimatedAngle.json
index f941effbe0f8b0..94ab790d724856 100644
--- a/api/SVGAnimatedAngle.json
+++ b/api/SVGAnimatedAngle.json
@@ -14,10 +14,10 @@
             "version_added": "≤18"
           },
           "firefox": {
-            "version_added": true
+            "version_added": "1.5"
           },
           "firefox_android": {
-            "version_added": true
+            "version_added": "4"
           },
           "ie": {
             "version_added": null
diff --git a/api/SVGAnimatedBoolean.json b/api/SVGAnimatedBoolean.json
index 02ee42f6042eb4..dcce12284c1944 100644
--- a/api/SVGAnimatedBoolean.json
+++ b/api/SVGAnimatedBoolean.json
@@ -14,10 +14,10 @@
             "version_added": "≤18"
           },
           "firefox": {
-            "version_added": true
+            "version_added": "3"
           },
           "firefox_android": {
-            "version_added": true
+            "version_added": "4"
           },
           "ie": {
             "version_added": null
diff --git a/api/SVGAnimatedEnumeration.json b/api/SVGAnimatedEnumeration.json
index d43b47d9b937c0..ab14d7c106fad7 100644
--- a/api/SVGAnimatedEnumeration.json
+++ b/api/SVGAnimatedEnumeration.json
@@ -14,10 +14,10 @@
             "version_added": "≤18"
           },
           "firefox": {
-            "version_added": true
+            "version_added": "1.5"
           },
           "firefox_android": {
-            "version_added": true
+            "version_added": "4"
           },
           "ie": {
             "version_added": null
diff --git a/api/SVGAnimatedInteger.json b/api/SVGAnimatedInteger.json
index 615e5e001671a4..6535f70d698c13 100644
--- a/api/SVGAnimatedInteger.json
+++ b/api/SVGAnimatedInteger.json
@@ -14,10 +14,10 @@
             "version_added": "≤18"
           },
           "firefox": {
-            "version_added": true
+            "version_added": "3"
           },
           "firefox_android": {
-            "version_added": true
+            "version_added": "4"
           },
           "ie": {
             "version_added": null
diff --git a/api/SVGAnimatedLength.json b/api/SVGAnimatedLength.json
index a312cd8b6cfa0d..0df4d3b325ee24 100644
--- a/api/SVGAnimatedLength.json
+++ b/api/SVGAnimatedLength.json
@@ -14,10 +14,10 @@
             "version_added": "≤18"
           },
           "firefox": {
-            "version_added": true
+            "version_added": "1.5"
           },
           "firefox_android": {
-            "version_added": true
+            "version_added": "4"
           },
           "ie": {
             "version_added": null
diff --git a/api/SVGAnimatedLengthList.json b/api/SVGAnimatedLengthList.json
index c36f935ff970a5..31a86690586510 100644
--- a/api/SVGAnimatedLengthList.json
+++ b/api/SVGAnimatedLengthList.json
@@ -14,10 +14,10 @@
             "version_added": "≤18"
           },
           "firefox": {
-            "version_added": true
+            "version_added": "1.5"
           },
           "firefox_android": {
-            "version_added": true
+            "version_added": "4"
           },
           "ie": {
             "version_added": null
diff --git a/api/SVGAnimatedNumber.json b/api/SVGAnimatedNumber.json
index 703b5025093d35..e301efd3d0e05b 100644
--- a/api/SVGAnimatedNumber.json
+++ b/api/SVGAnimatedNumber.json
@@ -14,10 +14,10 @@
             "version_added": "≤18"
           },
           "firefox": {
-            "version_added": true
+            "version_added": "1.5"
           },
           "firefox_android": {
-            "version_added": true
+            "version_added": "4"
           },
           "ie": {
             "version_added": null
diff --git a/api/SVGAnimatedNumberList.json b/api/SVGAnimatedNumberList.json
index 0dabed61ccce27..253122fa8f7b17 100644
--- a/api/SVGAnimatedNumberList.json
+++ b/api/SVGAnimatedNumberList.json
@@ -14,10 +14,10 @@
             "version_added": "≤18"
           },
           "firefox": {
-            "version_added": true
+            "version_added": "1.5"
           },
           "firefox_android": {
-            "version_added": true
+            "version_added": "4"
           },
           "ie": {
             "version_added": null
diff --git a/api/SVGAnimatedPoints.json b/api/SVGAnimatedPoints.json
index 6c616724feaa79..662dfffa2ccc84 100644
--- a/api/SVGAnimatedPoints.json
+++ b/api/SVGAnimatedPoints.json
@@ -14,10 +14,12 @@
             "version_added": "≤18"
           },
           "firefox": {
-            "version_added": null
+            "version_added": "1.5",
+            "version_removed": "21"
           },
           "firefox_android": {
-            "version_added": null
+            "version_added": "4",
+            "version_removed": "21"
           },
           "ie": {
             "version_added": null
diff --git a/api/SVGAnimatedPreserveAspectRatio.json b/api/SVGAnimatedPreserveAspectRatio.json
index 7056ead17539e6..e5b1dbef1998f4 100644
--- a/api/SVGAnimatedPreserveAspectRatio.json
+++ b/api/SVGAnimatedPreserveAspectRatio.json
@@ -14,10 +14,10 @@
             "version_added": "≤18"
           },
           "firefox": {
-            "version_added": true
+            "version_added": "1.5"
           },
           "firefox_android": {
-            "version_added": true
+            "version_added": "4"
           },
           "ie": {
             "version_added": null
diff --git a/api/SVGAnimatedRect.json b/api/SVGAnimatedRect.json
index 971a3184cc72c9..c787a3c053dffd 100644
--- a/api/SVGAnimatedRect.json
+++ b/api/SVGAnimatedRect.json
@@ -14,10 +14,10 @@
             "version_added": "≤18"
           },
           "firefox": {
-            "version_added": true
+            "version_added": "1.5"
           },
           "firefox_android": {
-            "version_added": true
+            "version_added": "4"
           },
           "ie": {
             "version_added": null
diff --git a/api/SVGAnimatedString.json b/api/SVGAnimatedString.json
index 37d97d06028d30..fd72d93ace5cd1 100644
--- a/api/SVGAnimatedString.json
+++ b/api/SVGAnimatedString.json
@@ -14,10 +14,10 @@
             "version_added": "12"
           },
           "firefox": {
-            "version_added": true
+            "version_added": "1.5"
           },
           "firefox_android": {
-            "version_added": true
+            "version_added": "4"
           },
           "ie": {
             "version_added": false
@@ -61,10 +61,10 @@
               "version_added": "12"
             },
             "firefox": {
-              "version_added": true
+              "version_added": "1.5"
             },
             "firefox_android": {
-              "version_added": true
+              "version_added": "4"
             },
             "ie": {
               "version_added": false
@@ -109,10 +109,10 @@
               "version_added": "12"
             },
             "firefox": {
-              "version_added": true
+              "version_added": "1.5"
             },
             "firefox_android": {
-              "version_added": true
+              "version_added": "4"
             },
             "ie": {
               "version_added": false