Firefox (-moz-) vendor-prefixed CSS extensions

A vendor prefix is used to indicate that a feature is specific to a certain browser. Firefox supports several extensions to CSS, which are prefixed with -moz-.

-moz-prefixed properties without standard equivalents

[!NOTE] These extensions are mostly experimental or deprecated but kept for backward compatibility. You should avoid using them on production websites.

• -moz-float-edge Deprecated
• -moz-force-broken-image-icon Deprecated: Use alt text instead.
• -moz-orient
• -moz-osx-font-smoothing: A similar font-smooth equivalent exists.
• -moz-user-focus Deprecated
• -moz-user-input Deprecated
• -moz-user-modify: A non-prefixed user-modify equivalent exists, but the HTML contenteditable attribute is recommended instead.

-moz-prefixed properties with standard equivalents

The following properties were implemented first using the -moz- vendor prefix, but are now supported in Firefox using the standard (non-prefixed) syntax. Support for the prefixed version is typically dropped eventually, so use the standard property instead.

A

• -moz-animation Deprecated: Prefixed version still supported.
• -moz-animation-delay Deprecated: Prefixed version still supported.
• -moz-animation-direction Deprecated: Prefixed version still supported.
• -moz-animation-duration Deprecated: Prefixed version still supported.
• -moz-animation-fill-mode Deprecated: Prefixed version still supported.
• -moz-animation-iteration-count Deprecated: Prefixed version still supported.
• -moz-animation-name Deprecated: Prefixed version still supported.
• -moz-animation-play-state Deprecated: Prefixed version still supported.
• -moz-animation-timing-function Deprecated: Prefixed version still supported.
• -moz-appearance: The prefixed version of appearance is still supported.

B

• -moz-backface-visibility Deprecated: Prefixed version still supported.
• -moz-background-clip Deprecated: Not supported; use background-clip.
• -moz-background-origin Deprecated: Not supported; use background-origin.
• -moz-box-align Deprecated: Use CSS flexbox with align-items.
• -moz-background-inline-policy Deprecated: Not supported; use box-decoration-break.
• -moz-box-direction Deprecated: Use CSS flexbox with flex-direction.
• -moz-box-flex Deprecated: Use CSS flexbox with flex-grow.
• -moz-box-ordinal-group Deprecated: Use CSS flexbox with order.
• -moz-box-orient Deprecated: Use CSS flexbox with flex-direction.
• -moz-box-pack Deprecated: Use CSS flexbox with justify-content.
• -moz-background-size Deprecated: Not supported; use background-size.
• -moz-border-end Deprecated: Not supported; use border-inline-end.
• -moz-border-end-color Deprecated: Not supported; use border-inline-end-color.
• -moz-border-end-style Deprecated: Not supported; use border-inline-end-style.
• -moz-border-end-width Deprecated: Not supported; use border-inline-end-width.
• -moz-border-image Deprecated: Not supported; use border-inline-end-width.
• -moz-border-start Deprecated: Not supported; use border-inline-start.
• -moz-border-start-color Deprecated: Not supported; use border-inline-start-color.
• -moz-border-start-style Deprecated: Not supported; use border-inline-start-style.
• -moz-border-start-width Deprecated: Not supported; use border-inline-start-width.
• -moz-box-sizing Deprecated: Prefixed version still supported.

C

• -moz-column-count Deprecated: Not supported; use column-count.
• -moz-column-fill Deprecated: Not supported; use column-fill.
• -moz-column-gap Deprecated: Not supported; use column-gap.
• -moz-column-width Deprecated: Not supported; use column-width.
• -moz-column-rule Deprecated: Not supported; use column-rule.
• -moz-column-rule-width Deprecated: Not supported; use column-rule-width.
• -moz-column-rule-style Deprecated: Not supported; use column-rule-style.
• -moz-column-rule-color Deprecated: Not supported; use column-rule-color.

F–M

• -moz-font-feature-settings Deprecated: Prefixed version still supported.
• -moz-font-language-override Deprecated: Prefixed version still supported.
• -moz-hyphens Deprecated: Prefixed version still supported.
• -moz-margin-end Deprecated: Not supported; use margin-inline-end.
• -moz-margin-start Deprecated: Not supported; use margin-inline-start.

O-P

• -moz-opacity Deprecated: Not supported; use opacity.
• -moz-outline Deprecated: Not supported; use outline.
• -moz-outline-color Deprecated: Not supported; use outline-color.
• -moz-outline-offset Deprecated: Not supported; use outline-offset.
• -moz-outline-style Deprecated: Not supported; use outline-style.
• -moz-outline-width Deprecated: Not supported; use outline-width.
• -moz-padding-end Deprecated: Not supported; use padding-inline-end.
• -moz-padding-start Deprecated: Not supported; use padding-inline-start.
• -moz-perspective Deprecated: Prefixed version still supported.
• -moz-perspective-origin Deprecated: Prefixed version still supported.

T–Z

• -moz-tab-size: Use tab-size
• -moz-text-align-last Deprecated: Not supported; use text-align-last.
• -moz-text-decoration-color Deprecated: Not supported; use text-decoration-color.
• -moz-text-decoration-line Deprecated: Not supported; use text-decoration-line.
• -moz-text-decoration-style Deprecated: Not supported; use text-decoration-style.
• -moz-text-size-adjust: See text-size-adjust Experimental.
• -moz-transform Deprecated: Prefixed version still supported.
• -moz-transform-origin Deprecated: Prefixed version still supported.
• -moz-transform-style Deprecated: Prefixed version still supported.
• -moz-transition Deprecated: Not supported; use transition.
• -moz-transition-delay Deprecated: Not supported; use transition-delay.
• -moz-transition-duration Deprecated: Not supported; use transition-duration.
• -moz-transition-property Deprecated: Not supported; use transition-property.
• -moz-transition-timing-function Deprecated: Not supported; use transition-timing-function.
• -moz-user-select: Use user-select.

-moz-prefixed property values

Global values

• -moz-initial: See initial.

background-image

Property: background-image

• -moz-linear-gradient Deprecated: Use gradient/linear-gradient.
• -moz-radial-gradient Deprecated: Use gradient/radial-gradient.
• -moz-element Deprecated: Use element.
• -moz-image-rect Deprecated

border-style and outline-style

Properties: border-style and outline-style.

• -moz-bg-inset Deprecated
• -moz-bg-outset Deprecated
• -moz-bg-solid Deprecated

<color> keywords

Type: <color>

• -moz-activehyperlinktext
• -moz-hyperlinktext
• -moz-visitedhyperlinktext
• -moz-buttonhoverface
• -moz-buttonhovertext
• -moz-default-background-color
• -moz-default-color
• -moz-cellhighlight
• -moz-cellhighlighttext
• -moz-field
• -moz-fieldtext
• -moz-dialog
• -moz-dialogtext
• -moz-menuhover
• -moz-menuhovertext

empty-cells

Property: empty-cells

• -moz-show-background (default value in quirks mode)

font-family

Property: font-family

• -moz-fixed

image-rendering

Property: image-rendering

• -moz-crisp-edges Deprecated: Use crisp-edges.

<length>

Type: <length>

• -moz-calcDeprecated: Use calc.

list-style-type

Property: list-style-type

Several vendor-prefixed values for list-style-type are now supported as standard values without a -moz- prefix, except for those in the following list. See Browser Compatibility for details.

• -moz-ethiopic-halehame
• -moz-ethiopic-halehame-am
• -moz-ethiopic-halehame-ti-er
• -moz-ethiopic-halehame-ti-et
• -moz-hangul
• -moz-hangul-consonant
• -moz-urdu

text-align

Property: text-align

• -moz-center Deprecated: Use text-align: center.
• -moz-left Deprecated: Use text-align: left.
• -moz-right Deprecated: Use text-align: right.

width, min-width, and max-width

Properties: width, min-width, and max-width

• -moz-min-content: See min-content.
• -moz-fit-content: See fit-content.
• -moz-max-content: See max-content.
• -moz-available: See stretch.

Pseudo-classes

• :-moz-any Deprecated: Use :is.
• :-moz-any-link Deprecated: Use :any-link.
• :-moz-broken Deprecated
• :-moz-drag-over
• :-moz-first-node
• :-moz-full-screen Deprecated: Not supported; use :fullscreen.
• :-moz-full-screen-ancestor Deprecated: Not supported; use :fullscreen.
• :-moz-handler-blocked
• :-moz-handler-crashed
• :-moz-handler-disabled
• :-moz-last-node
• :-moz-loading
• :-moz-locale-dir(ltr)
• :-moz-locale-dir(rtl)
• :-moz-native-anonymous
• :-moz-placeholder Deprecated: Use :placeholder-shown.
• :-moz-only-whitespace
• :-moz-read-only Deprecated: Use :read-only.
• :-moz-read-write Deprecated: Use :read-write.
• :-moz-submit-invalid: See :invalid.
• :-moz-suppressed
• :-moz-ui-invalid Deprecated: Use :user-invalid.
• :-moz-ui-valid Deprecated: Use :user-valid.
• :-moz-user-disabled
• :-moz-window-inactive

Pseudo-elements

• ::-moz-canvas
• ::-moz-cell-content
• ::-moz-color-swatch
• ::-moz-focus-inner
• ::-moz-focus-outer
• ::-moz-inline-table
• ::-moz-list-bullet
• ::-moz-list-number
• ::-moz-meter-bar
• ::-moz-pagebreak
• ::-moz-pagecontent
• ::-moz-placeholder Deprecated: Use ::placeholder.
• ::-moz-progress-bar
• ::-moz-range-progress
• ::-moz-range-thumb
• ::-moz-range-track
• ::-moz-scrolled-canvas
• ::-moz-scrolled-content
• ::-moz-selection Deprecated: Use ::selection.
• ::-moz-svg-foreign-content
• ::-moz-table
• ::-moz-table-cell
• ::-moz-table-column
• ::-moz-table-column-group
• ::-moz-table-outer
• ::-moz-table-row
• ::-moz-table-row-group
• ::-moz-viewport
• ::-moz-viewport-scroll

At-rules

• @-moz-document

Media features

• -moz-device-pixel-ratio Deprecated
• -moz-platform
• -moz-windows-glass

Other

• -moz-alt-content: See Firefox bug 11011

See also

• WebKit (-webkit-) vendor-prefixed CSS extensions
• Vendor Prefix glossary entry