adding css for a firefox display:inline-grid and reset to block if @support...

 adding css for a firefox  display:inline-grid and reset to block if @support break-inside attribute

source/_patterns/04-components/svg/icons/_menu-arrow-down.svg.twig

+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16">
+<title>chevron-down</title>
+<path fill="#323a45" d="M3.529 6.471l4 4c0.261 0.261 0.683 0.261 0.943 0l4-4c0.261-0.261 0.261-0.683 0-0.943s-0.683-0.261-0.943 0l-3.529 3.529-3.529-3.529c-0.261-0.261-0.683-0.261-0.943 0s-0.261 0.683 0 0.943z"></path>
+</svg>

source/_patterns/04-components/svg/icons/_menu-arrow-right.svg.twig

+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16">
+<title>chevron-right</title>
+<path fill="#f7f7f7" d="M6.471 12.471l4-4c0.261-0.261 0.261-0.683 0-0.943l-4-4c-0.261-0.261-0.683-0.261-0.943 0s-0.261 0.683 0 0.943l3.529 3.529-3.529 3.529c-0.261 0.261-0.261 0.683 0 0.943s0.683 0.261 0.943 0z"></path>
+</svg>

source/_patterns/04-components/svg/icons/_messages-error.svg.twig

+<svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" width="52" height="52" viewBox="0 0 52 52"><defs><style>.cls-1{fill:#ffc5c2;}</style></defs><title>messages-error</title><g id="Page-1"><g id="messages-warning"><path id="Shape" class="cls-1" d="M51.51,46.09l-22.26-44A4,4,0,0,0,27.88.56a3.44,3.44,0,0,0-3.76,0,4,4,0,0,0-1.37,1.53L.49,46.09A4,4,0,0,0,.55,50,3.82,3.82,0,0,0,1.9,51.47,3.45,3.45,0,0,0,3.74,52H48.26a3.45,3.45,0,0,0,1.84-.53A3.82,3.82,0,0,0,51.45,50,4,4,0,0,0,51.51,46.09ZM29.71,43a1,1,0,0,1-.27.73.88.88,0,0,1-.66.3H23.22a.85.85,0,0,1-.65-.3,1,1,0,0,1-.28-.73V37a1,1,0,0,1,.28-.73.85.85,0,0,1,.65-.3h5.56a.88.88,0,0,1,.66.3,1,1,0,0,1,.27.73V43Zm-.06-11.69a.72.72,0,0,1-.3.52,1.16,1.16,0,0,1-.68.2H23.3a1.19,1.19,0,0,1-.69-.2.63.63,0,0,1-.29-.52L21.83,17a.77.77,0,0,1,.29-.66,1.11,1.11,0,0,1,.69-.34h6.38a1.06,1.06,0,0,1,.69.34.7.7,0,0,1,.29.6Z"/></g></g></svg>
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source/_patterns/04-components/svg/icons/_messages-status.svg.twig

+<svg id="Capa_1" data-name="Capa 1" xmlns="http://www.w3.org/2000/svg" width="52" height="52" viewBox="0 0 52 52"><defs><style>.cls-1{fill:#94bfa2;}</style></defs><title>messages-status</title><path class="cls-1" d="M26,0A26,26,0,1,0,52,26,26,26,0,0,0,26,0ZM22.32,38.26,10.07,26,15,21.1l7.35,7.35L37,13.75l4.9,4.9Z"/></svg>
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source/_patterns/04-components/svg/icons/_messages-warning.svg.twig

+<svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" width="52" height="52" viewBox="0 0 52 52"><defs><style>.cls-1{fill:#fad980;}</style></defs><title>messages-warning</title><g id="Page-1"><g id="messages-warning"><path id="Shape" class="cls-1" d="M51.51,46.09l-22.26-44A4,4,0,0,0,27.88.56a3.44,3.44,0,0,0-3.76,0,4,4,0,0,0-1.37,1.53L.49,46.09A4,4,0,0,0,.55,50,3.82,3.82,0,0,0,1.9,51.47,3.45,3.45,0,0,0,3.74,52H48.26a3.45,3.45,0,0,0,1.84-.53A3.82,3.82,0,0,0,51.45,50,4,4,0,0,0,51.51,46.09ZM29.71,43a1,1,0,0,1-.27.73.88.88,0,0,1-.66.3H23.22a.85.85,0,0,1-.65-.3,1,1,0,0,1-.28-.73V37a1,1,0,0,1,.28-.73.85.85,0,0,1,.65-.3h5.56a.88.88,0,0,1,.66.3,1,1,0,0,1,.27.73V43Zm-.06-11.69a.72.72,0,0,1-.3.52,1.16,1.16,0,0,1-.68.2H23.3a1.19,1.19,0,0,1-.69-.2.63.63,0,0,1-.29-.52L21.83,17a.77.77,0,0,1,.29-.66,1.11,1.11,0,0,1,.69-.34h6.38a1.06,1.06,0,0,1,.69.34.7.7,0,0,1,.29.6Z"/></g></g></svg>
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source/_patterns/04-components/svg/icons/_minus.svg.twig

+<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 401.991 401.991"><path d="M394 154.174c-5.33-5.33-11.806-7.995-19.417-7.995H27.406c-7.61 0-14.084 2.66-19.414 7.99C2.662 159.5 0 165.97 0 173.586v54.82c0 7.617 2.662 14.086 7.992 19.41 5.33 5.332 11.803 7.994 19.414 7.994h347.176c7.61 0 14.086-2.66 19.417-7.993 5.32-5.324 7.99-11.793 7.99-19.41v-54.82c0-7.615-2.66-14.087-7.99-19.413z"/></svg>

source/_patterns/04-components/svg/icons/_mobile-arrow-down-y.svg.twig

+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32">
+<path class="st0" d="M17.6,0.2L9.5,8.3L1.4,0.2L0,1.6l9.6,9.6L19,1.8l-1.7-1.7h0.3V0.2z"/>
+</svg>

source/_patterns/04-components/svg/icons/_mobile-arrow-down.svg.twig

+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32">
+<path d="M17.6,0.2L9.5,8.3L1.4,0.2L0,1.6l9.6,9.6L19,1.8l-1.7-1.7h0.3C17.6,0.1,17.6,0.2,17.6,0.2z"/>
+</svg>

source/_patterns/04-components/svg/icons/_mobile-arrow-up-y.svg.twig

+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32">
+<path class="st0" d="M1.4,11.2l8.1-8.1l8.1,8.1L19,9.8L9.4,0.2L0,9.5l1.7,1.7H1.4z"/>
+</svg>

source/_patterns/04-components/svg/icons/_mobile-arrow-up.svg.twig

+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32">
+<path d="M1.4,11.2l8.1-8.1l8.1,8.1L19,9.8L9.4,0.2L0,9.5l1.7,1.7H1.4z"/>
+</svg>

source/_patterns/04-components/svg/icons/_mobile-close.svg.twig

+<svg width="22" height="22" viewBox="0 0 22 22" xmlns="http://www.w3.org/2000/svg" version="1.1">
+<path fill="#555559" d="M21.9 2.2l-2.2-2.2-8.8 8.8-8.8-8.8-2.2 2.2 8.8 8.8-8.8 8.8 2.2 2.2 8.8-8.8 8.8 8.8 2.2-2.2-8.8-8.8 8.8-8.8z"/>
+</svg>

source/_patterns/04-components/svg/icons/_mobile-menu.svg.twig

+<svg width="33" height="22" viewBox="0 0 33 22" xmlns="http://www.w3.org/2000/svg" version="1.1">
+<path fill="#555559" d="M0 22h33.1v-3.7h-33.1v3.7zM0 12.8h33.1v-3.7h-33.1v3.7zM0 0v3.7h33.1v-3.7h-33.1z"/>
+</svg>

source/_patterns/04-components/svg/icons/_opera.svg.twig

+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32">
+<title>opera</title>
+<path d="M15.939 0c-8.741 0-15.023 6.34-15.023 15.851 0 8.463 6.109 16.149 15.024 16.149 9.002 0 15.144-7.684 15.144-16.149 0-9.586-6.483-15.851-15.146-15.851zM21.511 15.579c-0.002 5.292-0.284 12.828-5.571 12.828v0.001c-5.212 0-5.42-7.54-5.42-12.822 0-6.199 0.58-12.143 5.42-12.143s5.571 6.018 5.571 12.136z"></path>
+</svg>

source/_patterns/04-components/svg/icons/_pencil.svg.twig

+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32">
+<title>pencil</title>
+<path d="M27 0c2.761 0 5 2.239 5 5 0 1.126-0.372 2.164-1 3l-2 2-7-7 2-2c0.836-0.628 1.874-1 3-1zM2 23l-2 9 9-2 18.5-18.5-7-7-18.5 18.5zM22.362 11.362l-14 14-1.724-1.724 14-14 1.724 1.724z"></path>
+</svg>

source/_patterns/04-components/svg/icons/_play.svg.twig

+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32">
+<title>play</title>
+<path d="M30.662 5.003c-4.488-0.645-9.448-1.003-14.662-1.003s-10.174 0.358-14.662 1.003c-0.86 3.366-1.338 7.086-1.338 10.997s0.477 7.63 1.338 10.997c4.489 0.645 9.448 1.003 14.662 1.003s10.174-0.358 14.662-1.003c0.86-3.366 1.338-7.086 1.338-10.997s-0.477-7.63-1.338-10.997zM12 22v-12l10 6-10 6z"></path>
+</svg>

source/_patterns/04-components/svg/icons/_plus.svg.twig

+<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 401.994 401.994">
+  <path d="M394 154.175c-5.33-5.33-11.806-7.994-19.417-7.994H255.81V27.41c0-7.61-2.665-14.084-7.993-19.414C242.487 2.666 236.02 0 228.397 0h-54.81c-7.613 0-14.085 2.663-19.415 7.993-5.33 5.33-7.994 11.803-7.994 19.414v118.775H27.408c-7.612 0-14.085 2.664-19.415 7.994S0 165.973 0 173.59v54.818c0 7.618 2.662 14.086 7.992 19.41 5.33 5.333 11.803 7.995 19.414 7.995h118.77V374.59c0 7.61 2.665 14.09 7.995 19.417 5.33 5.325 11.806 7.987 19.418 7.987H228.4c7.618 0 14.087-2.662 19.418-7.987 5.332-5.33 7.994-11.806 7.994-19.417V255.813h118.77c7.618 0 14.09-2.662 19.417-7.994 5.325-5.33 7.99-11.797 7.99-19.415v-54.82c0-7.615-2.66-14.086-7.993-19.413z"/>
+</svg>

source/_patterns/04-components/svg/icons/_podcast.svg.twig

+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32">
+<title>podcast</title>
+<path d="M32 16c0-8.837-7.163-16-16-16s-16 7.163-16 16c0 6.877 4.339 12.739 10.428 15.002l-0.428 0.998h12l-0.428-0.998c6.089-2.263 10.428-8.125 10.428-15.002zM15.212 19.838c-0.713-0.306-1.212-1.014-1.212-1.838 0-1.105 0.895-2 2-2s2 0.895 2 2c0 0.825-0.499 1.533-1.212 1.839l-0.788-1.839-0.788 1.838zM16.821 19.915c1.815-0.379 3.179-1.988 3.179-3.915 0-2.209-1.791-4-4-4s-4 1.791-4 4c0 1.928 1.364 3.535 3.18 3.913l-2.332 5.441c-2.851-1.223-4.848-4.056-4.848-7.355 0-4.418 3.582-8.375 8-8.375s8 3.957 8 8.375c0 3.299-1.997 6.131-4.848 7.355l-2.331-5.439zM21.514 30.866l-2.31-5.39c3.951-1.336 6.796-5.073 6.796-9.476 0-5.523-4.477-10-10-10s-10 4.477-10 10c0 4.402 2.845 8.14 6.796 9.476l-2.31 5.39c-4.987-2.14-8.481-7.095-8.481-12.866 0-7.729 6.266-14.37 13.995-14.37s13.995 6.641 13.995 14.37c0 5.771-3.494 10.726-8.481 12.866z"></path>
+</svg>

source/_patterns/04-components/svg/icons/_rss-box.svg.twig

+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32">
+<title>rss-box</title>
+<path d="M26.667 0h-21.333c-2.934 0-5.334 2.4-5.334 5.334v21.332c0 2.935 2.4 5.334 5.334 5.334h21.333c2.934 0 5.333-2.398 5.333-5.334v-21.332c0-2.934-2.399-5.334-5.333-5.334zM8.717 25.977c-1.499 0-2.717-1.209-2.717-2.707 0-1.49 1.218-2.713 2.717-2.713 1.505 0 2.721 1.223 2.721 2.713-0 1.498-1.216 2.707-2.721 2.707zM15.546 26c0-2.557-0.994-4.963-2.796-6.764-1.804-1.805-4.199-2.801-6.747-2.801v-3.912c7.427 0 13.473 6.045 13.473 13.477l-3.93 0zM22.488 26c0-9.096-7.396-16.498-16.48-16.498v-3.914c11.25 0 20.405 9.16 20.405 20.412l-3.924-0z"></path>
+</svg>

source/_patterns/04-components/svg/icons/_safari.svg.twig

+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32">
+<title>safari</title>
+<path d="M16 2c-0.752 0-1.491 0.056-2.213 0.163-0.009-0.024-0.020-0.048-0.031-0.072 0.401-0.313 0.611-0.745 0.52-1.173-0.117-0.549-0.7-0.918-1.451-0.918-0.162 0-0.327 0.018-0.49 0.052-0.943 0.2-1.567 0.894-1.421 1.58 0.089 0.417 0.447 0.729 0.943 0.856-0.001 0.030-0.001 0.061 0.001 0.092-6.269 1.798-10.857 7.573-10.857 14.42 0 8.284 6.716 15 15 15s15-6.716 15-15c0-8.284-6.716-15-15-15zM11.403 1.528c-0.085-0.398 0.39-0.85 1.036-0.987 0.129-0.027 0.259-0.041 0.386-0.041 0.501 0 0.897 0.215 0.962 0.522 0.050 0.235-0.096 0.488-0.356 0.684-0.22-0.155-0.501-0.223-0.784-0.162-0.283 0.060-0.511 0.235-0.649 0.464-0.318-0.077-0.547-0.253-0.595-0.48zM24.043 25.043c-1.374 1.374-3.038 2.352-4.853 2.88l-1.325-2.149-0.336 2.499c-0.503 0.067-1.013 0.102-1.529 0.102-3.038 0-5.895-1.183-8.043-3.332-1.374-1.374-2.352-3.038-2.88-4.853l2.149-1.325-2.499-0.336c-0.067-0.503-0.102-1.013-0.102-1.529 0-3.038 1.183-5.895 3.332-8.043 1.374-1.374 3.038-2.352 4.853-2.88l1.325 2.149 0.336-2.499c0.503-0.067 1.013-0.102 1.529-0.102 3.038 0 5.895 1.183 8.043 3.332 1.374 1.374 2.352 3.038 2.88 4.853l-2.149 1.325 2.499 0.336c0.067 0.503 0.102 1.013 0.102 1.529 0 3.038-1.183 5.895-3.332 8.043zM23.778 9.222l-6.156 4.678c-0.458-0.239-0.965-0.377-1.482-0.398l-1.596-3.349-0.096 3.708c-0.415 0.204-0.784 0.489-1.090 0.842l-1.972-0.699 1.44 1.517c-0.198 0.422-0.308 0.876-0.326 1.338l-3.349 1.596 3.711 0.096c0.012 0.024 0.024 0.048 0.037 0.071l-4.678 6.156 6.156-4.678c0.458 0.239 0.965 0.377 1.482 0.398l1.596 3.349 0.096-3.708c0.415-0.204 0.785-0.489 1.090-0.842l1.972 0.699-1.44-1.517c0.198-0.422 0.308-0.876 0.326-1.338l3.349-1.596-3.71-0.096c-0.012-0.024-0.024-0.048-0.037-0.071l4.678-6.156zM16.003 13.892v0zM15.376 14.066c0.21-0.045 0.42-0.066 0.627-0.066 0.13 0 0.258 0.008 0.384 0.025l0.003 0.001-0-0.001c0.273 0.036 0.537 0.109 0.785 0.216l-2.236 1.699-1.699 2.236c-0.074-0.175-0.133-0.359-0.174-0.552-0.345-1.621 0.69-3.214 2.311-3.558zM17.566 19.559v0 0c-0.283 0.173-0.599 0.303-0.942 0.376-0.21 0.045-0.42 0.066-0.627 0.066-0.13 0-0.258-0.009-0.385-0.025l-0.002-0.001 0 0.001c-0.273-0.036-0.537-0.109-0.785-0.215l2.236-1.699 1.699-2.236c0.074 0.175 0.133 0.359 0.174 0.552 0.272 1.278-0.314 2.538-1.368 3.183z"></path>
+</svg>

source/_patterns/04-components/svg/icons/_search-2.svg.twig

+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32">
+<title>search-2</title>
+<path d="M28.067 29.328l-7.159-10.519c4.091-3.24 5.248-9.105 2.49-13.695-2.995-4.986-9.488-6.604-14.474-3.61-4.985 2.996-6.604 9.489-3.609 14.474 2.701 4.496 8.248 6.253 12.967 4.357l5.946 11.299c0.184 0.351 0.613 0.47 0.952 0.267l2.674-1.608c0.34-0.204 0.435-0.638 0.212-0.966zM18.049 16.689c-3.388 2.035-7.8 0.935-9.836-2.453s-0.934-7.8 2.453-9.835c3.387-2.036 7.799-0.935 9.834 2.453s0.936 7.801-2.452 9.835z"></path>
+</svg>