diff --git a/Cargo.lock b/Cargo.lock
index fe176efbe7c..7d37a57b7b1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4654,8 +4654,6 @@ dependencies = [
  "servo_arc",
  "smallvec 1.0.0",
  "thin-slice",
- "to_shmem",
- "to_shmem_derive",
 ]
 
 [[package]]
diff --git a/components/selectors/Cargo.toml b/components/selectors/Cargo.toml
index 21077f426c6..1aaebdc167d 100644
--- a/components/selectors/Cargo.toml
+++ b/components/selectors/Cargo.toml
@@ -31,8 +31,6 @@ precomputed-hash = "0.1"
 servo_arc = { version = "0.1", path = "../servo_arc" }
 smallvec = "1.0"
 thin-slice = "0.1.0"
-to_shmem = { path = "../to_shmem" }
-to_shmem_derive = { path = "../to_shmem_derive" }
 
 [build-dependencies]
 phf_codegen = "0.8"
diff --git a/components/selectors/attr.rs b/components/selectors/attr.rs
index 96abbe1c132..36d31e11345 100644
--- a/components/selectors/attr.rs
+++ b/components/selectors/attr.rs
@@ -6,15 +6,11 @@ use crate::parser::SelectorImpl;
 use cssparser::ToCss;
 use std::fmt;
 
-#[derive(Clone, Eq, PartialEq, ToShmem)]
-#[shmem(no_bounds)]
+#[derive(Clone, Eq, PartialEq)]
 pub struct AttrSelectorWithOptionalNamespace<Impl: SelectorImpl> {
-    #[shmem(field_bound)]
     pub namespace: Option<NamespaceConstraint<(Impl::NamespacePrefix, Impl::NamespaceUrl)>>,
-    #[shmem(field_bound)]
     pub local_name: Impl::LocalName,
     pub local_name_lower: Impl::LocalName,
-    #[shmem(field_bound)]
     pub operation: ParsedAttrSelectorOperation<Impl::AttrValue>,
     pub never_matches: bool,
 }
@@ -28,7 +24,7 @@ impl<Impl: SelectorImpl> AttrSelectorWithOptionalNamespace<Impl> {
     }
 }
 
-#[derive(Clone, Eq, PartialEq, ToShmem)]
+#[derive(Clone, Eq, PartialEq)]
 pub enum NamespaceConstraint<NamespaceUrl> {
     Any,
 
@@ -36,7 +32,7 @@ pub enum NamespaceConstraint<NamespaceUrl> {
     Specific(NamespaceUrl),
 }
 
-#[derive(Clone, Eq, PartialEq, ToShmem)]
+#[derive(Clone, Eq, PartialEq)]
 pub enum ParsedAttrSelectorOperation<AttrValue> {
     Exists,
     WithValue {
@@ -76,7 +72,7 @@ impl<AttrValue> AttrSelectorOperation<AttrValue> {
     }
 }
 
-#[derive(Clone, Copy, Eq, PartialEq, ToShmem)]
+#[derive(Clone, Copy, Eq, PartialEq)]
 pub enum AttrSelectorOperator {
     Equal,
     Includes,
@@ -136,7 +132,7 @@ impl AttrSelectorOperator {
 /// The definition of whitespace per CSS Selectors Level 3 § 4.
 pub static SELECTOR_WHITESPACE: &'static [char] = &[' ', '\t', '\n', '\r', '\x0C'];
 
-#[derive(Clone, Copy, Debug, Eq, PartialEq, ToShmem)]
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
 pub enum ParsedCaseSensitivity {
     // 's' was specified.
     ExplicitCaseSensitive,
diff --git a/components/selectors/builder.rs b/components/selectors/builder.rs
index 7a58e35d17f..607bb987932 100644
--- a/components/selectors/builder.rs
+++ b/components/selectors/builder.rs
@@ -193,7 +193,7 @@ fn split_from_end<T>(s: &[T], at: usize) -> (&[T], &[T]) {
 
 bitflags! {
     /// Flags that indicate at which point of parsing a selector are we.
-    #[derive(Default, ToShmem)]
+    #[derive(Default)]
     pub (crate) struct SelectorFlags : u8 {
         const HAS_PSEUDO = 1 << 0;
         const HAS_SLOTTED = 1 << 1;
@@ -201,7 +201,7 @@ bitflags! {
     }
 }
 
-#[derive(Clone, Copy, Debug, Eq, PartialEq, ToShmem)]
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
 pub struct SpecificityAndFlags {
     /// There are two free bits here, since we use ten bits for each specificity
     /// kind (id, class, element).
diff --git a/components/selectors/lib.rs b/components/selectors/lib.rs
index e8d8062dff7..1d9bf58edb3 100644
--- a/components/selectors/lib.rs
+++ b/components/selectors/lib.rs
@@ -21,9 +21,6 @@ extern crate precomputed_hash;
 extern crate servo_arc;
 extern crate smallvec;
 extern crate thin_slice;
-extern crate to_shmem;
-#[macro_use]
-extern crate to_shmem_derive;
 
 pub mod attr;
 pub mod bloom;
diff --git a/components/selectors/parser.rs b/components/selectors/parser.rs
index 92a5b039b90..0b550dd26ef 100644
--- a/components/selectors/parser.rs
+++ b/components/selectors/parser.rs
@@ -293,10 +293,9 @@ pub trait Parser<'i> {
     }
 }
 
-#[derive(Clone, Debug, Eq, PartialEq, ToShmem)]
-#[shmem(no_bounds)]
+#[derive(Clone, Debug, Eq, PartialEq)]
 pub struct SelectorList<Impl: SelectorImpl>(
-    #[shmem(field_bound)] pub SmallVec<[Selector<Impl>; 1]>,
+    pub SmallVec<[Selector<Impl>; 1]>,
 );
 
 impl<Impl: SelectorImpl> SelectorList<Impl> {
@@ -582,10 +581,9 @@ pub fn namespace_empty_string<Impl: SelectorImpl>() -> Impl::NamespaceUrl {
 ///
 /// This reordering doesn't change the semantics of selector matching, and we
 /// handle it in to_css to make it invisible to serialization.
-#[derive(Clone, Eq, PartialEq, ToShmem)]
-#[shmem(no_bounds)]
+#[derive(Clone, Eq, PartialEq)]
 pub struct Selector<Impl: SelectorImpl>(
-    #[shmem(field_bound)] ThinArc<SpecificityAndFlags, Component<Impl>>,
+    ThinArc<SpecificityAndFlags, Component<Impl>>,
 );
 
 impl<Impl: SelectorImpl> Selector<Impl> {
@@ -890,7 +888,7 @@ impl<'a, Impl: SelectorImpl> Iterator for AncestorIter<'a, Impl> {
     }
 }
 
-#[derive(Clone, Copy, Debug, Eq, PartialEq, ToShmem)]
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
 pub enum Combinator {
     Child,        //  >
     Descendant,   // space
@@ -941,27 +939,25 @@ impl Combinator {
 /// optimal packing and cache performance, see [1].
 ///
 /// [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1357973
-#[derive(Clone, Eq, PartialEq, ToShmem)]
-#[shmem(no_bounds)]
+#[derive(Clone, Eq, PartialEq)]
 pub enum Component<Impl: SelectorImpl> {
     Combinator(Combinator),
 
     ExplicitAnyNamespace,
     ExplicitNoNamespace,
-    DefaultNamespace(#[shmem(field_bound)] Impl::NamespaceUrl),
+    DefaultNamespace(Impl::NamespaceUrl),
     Namespace(
-        #[shmem(field_bound)] Impl::NamespacePrefix,
-        #[shmem(field_bound)] Impl::NamespaceUrl,
+        Impl::NamespacePrefix,
+        Impl::NamespaceUrl,
     ),
 
     ExplicitUniversalType,
     LocalName(LocalName<Impl>),
 
-    ID(#[shmem(field_bound)] Impl::Identifier),
-    Class(#[shmem(field_bound)] Impl::ClassName),
+    ID(Impl::Identifier),
+    Class(Impl::ClassName),
 
     AttributeInNoNamespaceExists {
-        #[shmem(field_bound)]
         local_name: Impl::LocalName,
         local_name_lower: Impl::LocalName,
     },
@@ -969,7 +965,6 @@ pub enum Component<Impl: SelectorImpl> {
     AttributeInNoNamespace {
         local_name: Impl::LocalName,
         operator: AttrSelectorOperator,
-        #[shmem(field_bound)]
         value: Impl::AttrValue,
         case_sensitivity: ParsedCaseSensitivity,
         never_matches: bool,
@@ -1001,7 +996,7 @@ pub enum Component<Impl: SelectorImpl> {
     FirstOfType,
     LastOfType,
     OnlyOfType,
-    NonTSPseudoClass(#[shmem(field_bound)] Impl::NonTSPseudoClass),
+    NonTSPseudoClass(Impl::NonTSPseudoClass),
     /// The ::slotted() pseudo-element:
     ///
     /// https://drafts.csswg.org/css-scoping/#slotted-pseudo
@@ -1016,7 +1011,7 @@ pub enum Component<Impl: SelectorImpl> {
     Slotted(Selector<Impl>),
     /// The `::part` pseudo-element.
     ///   https://drafts.csswg.org/css-shadow-parts/#part
-    Part(#[shmem(field_bound)] Box<[Impl::PartName]>),
+    Part(Box<[Impl::PartName]>),
     /// The `:host` pseudo-class:
     ///
     /// https://drafts.csswg.org/css-scoping/#host-selector
@@ -1027,7 +1022,7 @@ pub enum Component<Impl: SelectorImpl> {
     ///
     /// See https://github.com/w3c/csswg-drafts/issues/2158
     Host(Option<Selector<Impl>>),
-    PseudoElement(#[shmem(field_bound)] Impl::PseudoElement),
+    PseudoElement(Impl::PseudoElement),
 }
 
 impl<Impl: SelectorImpl> Component<Impl> {
@@ -1082,10 +1077,8 @@ impl<Impl: SelectorImpl> Component<Impl> {
     }
 }
 
-#[derive(Clone, Eq, PartialEq, ToShmem)]
-#[shmem(no_bounds)]
+#[derive(Clone, Eq, PartialEq)]
 pub struct LocalName<Impl: SelectorImpl> {
-    #[shmem(field_bound)]
     pub name: Impl::LocalName,
     pub lower_name: Impl::LocalName,
 }