--- a/devtools/client/themes/netmonitor.css
+++ b/devtools/client/themes/netmonitor.css
@@ -139,17 +139,16 @@
   overflow-x: hidden;
   overflow-y: auto;
   --timings-scale: 1;
   --timings-rev-scale: 1;
 }
 
 .requests-list-subitem {
   display: flex;
-  flex: none;
   box-sizing: border-box;
   align-items: center;
   padding: 3px;
   cursor: default;
 }
 
 .subitem-label {
   white-space: nowrap;
@@ -200,31 +199,32 @@
   background-color: rgba(0, 0, 0, 0.1);
 }
 
 .requests-list-header-button > .button-text {
   flex: auto;
   white-space: nowrap;
   overflow: hidden;
   text-overflow: ellipsis;
+  cursor: default;
 }
 
 .requests-list-header-button > .button-icon {
   flex: none;
   height: 4px;
   margin-inline-start: 3px;
   margin-inline-end: 6px;
   width: 7px;
 }
 
-.requests-list-header-button[data-sorted=ascending] > .button-icon {
+.requests-list-header-button.ascending > .button-icon {
   background-image: var(--sort-ascending-image);
 }
 
-.requests-list-header-button[data-sorted=descending] > .button-icon {
+.requests-list-header-button.descending > .button-icon {
   background-image: var(--sort-descending-image);
 }
 
 .requests-list-waterfall-label-wrapper {
   display: flex;
 }
 
 .requests-list-header-button[data-sorted],
@@ -268,56 +268,32 @@
 .theme-firebug .requests-list-header:hover:active {
   background-image: linear-gradient(rgba(0, 0, 0, 0.1),
                                     transparent);
 }
 
 
 /* Network requests table: specific column dimensions */
 
-.requests-list-status {
-  max-width: 6em;
-  text-align: center;
-  width: 10vw;
-}
-
-.requests-list-method,
-.requests-list-method-box {
-  max-width: 7em;
-  text-align: center;
-  width: 10vw;
-}
-
-.requests-list-icon-and-file {
-  width: 22vw;
-}
-
 .requests-list-icon {
   background: transparent;
   width: 15px;
   height: 15px;
   margin-inline-end: 4px;
-}
-
-.requests-list-icon {
   outline: 1px solid var(--table-splitter-color);
 }
 
-.requests-list-security-and-domain {
-  width: 14vw;
-}
-
-.requests-security-state-icon {
-  flex: none;
+.request-list-item .requests-domain {
   width: 16px;
   height: 16px;
   margin-inline-end: 4px;
+  background-repeat: no-repeat;
 }
 
-.request-list-item.selected .requests-security-state-icon {
+.request-list-item.selected .requests-domain {
   filter: brightness(1.3);
 }
 
 .security-state-insecure {
   background-image: url(chrome://devtools/skin/images/security-state-insecure.svg);
 }
 
 .security-state-secure {
@@ -331,32 +307,18 @@
 .security-state-broken {
   background-image: url(chrome://devtools/skin/images/security-state-broken.svg);
 }
 
 .security-state-local {
   background-image: url(chrome://devtools/skin/images/globe.svg);
 }
 
-.requests-list-type,
-.requests-list-size {
-  max-width: 6em;
-  width: 8vw;
-  justify-content: center;
-}
-
-.requests-list-transferred {
-  max-width: 8em;
-  width: 8vw;
-  justify-content: center;
-}
-
 .requests-list-cause {
-  max-width: 8em;
-  width: 8vw;
+  width: 90px;
 }
 
 .requests-list-cause-stack {
   background-color: var(--theme-body-color-alt);
   color: var(--theme-body-background);
   font-size: 8px;
   font-weight: bold;
   line-height: 10px;
@@ -378,18 +340,17 @@
   width: 3em;
   margin-inline-end: -3em !important;
 }
 
 .requests-list-status-icon {
   background: #fff;
   height: 10px;
   width: 10px;
-  margin-inline-start: 5px;
-  margin-inline-end: 5px;
+  margin-inline-end: 10px;
   border-radius: 10px;
   transition: box-shadow 0.5s ease-in-out;
   box-sizing: border-box;
 }
 
 .request-list-item.selected .requests-list-status-icon {
   filter: brightness(1.3);
 }
@@ -434,16 +395,17 @@
   transform: rotate(45deg);
 }
 
 /* Network requests table: waterfall header */
 
 .requests-list-waterfall {
   flex: auto;
   padding-inline-start: 0;
+  overflow: hidden;
 }
 
 .requests-list-waterfall-label-wrapper:not(.requests-list-waterfall-visible) {
   padding-inline-start: 16px;
 }
 
 .requests-list-timings-division {
   padding-top: 2px;
@@ -568,19 +530,20 @@
 /* SideMenuWidget */
 #network-table .request-list-empty-notice,
 #network-table .request-list-container {
   background-color: var(--theme-body-background);
 }
 
 .request-list-item {
   display: flex;
+  align-content: center;
   border-top-color: transparent;
   border-bottom-color: transparent;
-  padding: 0;
+  padding: 0 3px;
 }
 
 .request-list-item.selected {
   background-color: var(--theme-selection-background);
   color: var(--theme-selection-color);
 }
 
 .request-list-item:not(.selected).odd {
@@ -1025,54 +988,28 @@
 /* Responsive sidebar */
 @media (max-width: 700px) {
   #toolbar-spacer,
   .network-details-panel-toggle,
   .requests-list-network-summary-button > .summary-info-text {
     display: none;
   }
 
-  .requests-list-toolbar {
-    height: 22px;
-  }
-
   .requests-list-header-button {
     min-height: 22px;
     padding-left: 8px;
   }
 
-  .requests-list-status {
-    max-width: none;
-    width: 10vw;
-  }
-
   .requests-list-status-code {
     width: auto;
   }
 
   .requests-list-method,
   .requests-list-method-box {
     max-width: none;
-    width: 12vw;
-  }
-
-  .requests-list-icon-and-file {
-    width: 22vw;
-  }
-
-  .requests-list-security-and-domain {
-    width: 16vw;
-  }
-
-  .requests-list-cause,
-  .requests-list-type,
-  .requests-list-transferred,
-  .requests-list-size {
-    max-width: none;
-    width: 10vw;
   }
 
   .requests-list-waterfall {
     display: none;
   }
 
   .statistics-panel .charts-container {
     flex-direction: column;