--- a/toolkit/library/gtest/rust/Cargo.toml
+++ b/toolkit/library/gtest/rust/Cargo.toml
@@ -4,17 +4,16 @@ version = "0.1.0"
 authors = ["nobody@mozilla.org"]
 license = "MPL-2.0"
 description = "Testing code for libgkrust"
 
 [features]
 bindgen = ["gkrust-shared/bindgen"]
 servo = ["gkrust-shared/servo"]
 quantum_render = ["gkrust-shared/quantum_render"]
-gecko_debug = ["gkrust-shared/gecko_debug"]
 
 [dependencies]
 mp4parse-gtest = { path = "../../../../dom/media/gtest" }
 nsstring-gtest = { path = "../../../../xpcom/rust/nsstring/gtest" }
 gkrust-shared = { path = "../../rust/shared" }
 
 [lib]
 path = "lib.rs"

--- a/toolkit/library/gtest/rust/moz.build
+++ b/toolkit/library/gtest/rust/moz.build
@@ -9,12 +9,9 @@ if CONFIG['MOZ_STYLO']:
     features += ['servo']
 
     if CONFIG['MOZ_STYLO_BINDGEN']:
         features += ['bindgen']
 
 if CONFIG['MOZ_BUILD_WEBRENDER']:
     features += ['quantum_render']
 
-if CONFIG['MOZ_DEBUG']:
-    features += ['gecko_debug']
-
 RustLibrary('gkrust-gtest', features, '../..')

--- a/toolkit/library/rust/Cargo.toml
+++ b/toolkit/library/rust/Cargo.toml
@@ -4,17 +4,16 @@ version = "0.1.0"
 authors = ["nobody@mozilla.org"]
 license = "MPL-2.0"
 description = "Rust code for libxul"
 
 [features]
 bindgen = ["gkrust-shared/bindgen"]
 servo = ["gkrust-shared/servo"]
 quantum_render = ["gkrust-shared/quantum_render"]
-gecko_debug = ["gkrust-shared/gecko_debug"]
 
 [dependencies]
 gkrust-shared = { path = "shared" }
 
 [lib]
 path = "lib.rs"
 crate-type = ["staticlib"]
 test = false

--- a/toolkit/library/rust/moz.build
+++ b/toolkit/library/rust/moz.build
@@ -9,12 +9,9 @@ if CONFIG['MOZ_STYLO']:
     features += ['servo']
 
     if CONFIG['MOZ_STYLO_BINDGEN']:
         features += ['bindgen']
 
 if CONFIG['MOZ_BUILD_WEBRENDER']:
     features += ['quantum_render']
 
-if CONFIG['MOZ_DEBUG']:
-    features += ['gecko_debug']
-
 RustLibrary('gkrust', features, '..')

--- a/toolkit/library/rust/shared/Cargo.toml
+++ b/toolkit/library/rust/shared/Cargo.toml
@@ -13,17 +13,16 @@ nserror = { path = "../../../../xpcom/ru
 rust_url_capi = { path = "../../../../netwerk/base/rust-url-capi" }
 webrender_bindings = { path = "../../../../gfx/webrender_bindings", optional = true }
 
 [features]
 default = []
 bindgen = ["geckoservo/bindgen"]
 servo = ["geckoservo"]
 quantum_render = ["webrender_bindings"]
-gecko_debug = ["geckoservo/gecko_debug"]
 
 [lib]
 path = "lib.rs"
 test = false
 doctest = false
 bench = false
 doc = false
 plugin = false