Added a corner radius to tab icons

src/browser/themes/shared/tabbrowser/tabs-css.patch

@@ -1,5 +1,5 @@
 diff --git a/browser/themes/shared/tabbrowser/tabs.css b/browser/themes/shared/tabbrowser/tabs.css
-index 01815c2114a627e5cac183c702bd82f1bd4f58f8..ad3686a4bcac0331d86f5e95ecdb6f023b2641bf 100644
+index 01815c2114a627e5cac183c702bd82f1bd4f58f8..7b20eb17b53cfe13b8de968b1aa59c94b6468c0d 100644
 --- a/browser/themes/shared/tabbrowser/tabs.css
 +++ b/browser/themes/shared/tabbrowser/tabs.css
 @@ -31,7 +31,7 @@
@@ -37,7 +37,15 @@ index 01815c2114a627e5cac183c702bd82f1bd4f58f8..ad3686a4bcac0331d86f5e95ecdb6f02
  
      &::before {
        position: absolute;
-@@ -502,7 +501,7 @@
+@@ -437,6 +436,7 @@
+ .tab-icon-image {
+   -moz-context-properties: fill, stroke;
+   fill: currentColor;
++  border-radius: 4px;
+ 
+   /* Apply crisp rendering for favicons at exactly 2dppx resolution */
+   @media (resolution: 2dppx) {
+@@ -502,7 +502,7 @@
    z-index: 1; /* Overlay tab title */
  
    #tabbrowser-tabs[orient=vertical] & {
@@ -46,7 +54,7 @@ index 01815c2114a627e5cac183c702bd82f1bd4f58f8..ad3686a4bcac0331d86f5e95ecdb6f02
    }
  
    &[crashed] {
-@@ -510,7 +509,7 @@
+@@ -510,7 +510,7 @@
    }
  
    #tabbrowser-tabs[orient="vertical"]:not([expanded]) &:not([crashed]),
@@ -55,7 +63,7 @@ index 01815c2114a627e5cac183c702bd82f1bd4f58f8..ad3686a4bcac0331d86f5e95ecdb6f02
      &[soundplaying] {
        list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-playing-small.svg");
      }
-@@ -572,7 +571,7 @@
+@@ -572,7 +572,7 @@
    }
  
    #tabbrowser-tabs[orient="vertical"]:not([expanded]) &:is([soundplaying], [muted], [activemedia-blocked]),
@@ -64,7 +72,7 @@ index 01815c2114a627e5cac183c702bd82f1bd4f58f8..ad3686a4bcac0331d86f5e95ecdb6f02
    &[crashed] {
      display: revert;
    }
-@@ -586,7 +585,7 @@
+@@ -586,7 +586,7 @@
    --button-min-height-small: 24px;
    --button-border-radius: var(--border-radius-small);
  
@@ -73,7 +81,7 @@ index 01815c2114a627e5cac183c702bd82f1bd4f58f8..ad3686a4bcac0331d86f5e95ecdb6f02
      &:is([soundplaying], [muted], [activemedia-blocked]) {
        display: block;
      }
-@@ -617,14 +616,14 @@
+@@ -617,14 +617,14 @@
    }
  
    &[textoverflow] {
@@ -92,7 +100,7 @@ index 01815c2114a627e5cac183c702bd82f1bd4f58f8..ad3686a4bcac0331d86f5e95ecdb6f02
        direction: rtl;
        mask-image: linear-gradient(to right, transparent, black var(--tab-label-mask-size));
      }
-@@ -1170,7 +1169,7 @@
+@@ -1170,7 +1170,7 @@
    }
  }
  
@@ -101,7 +109,7 @@ index 01815c2114a627e5cac183c702bd82f1bd4f58f8..ad3686a4bcac0331d86f5e95ecdb6f02
  #vertical-tabs-newtab-button {
    appearance: none;
    min-height: var(--tab-min-height);
-@@ -1181,7 +1180,7 @@
+@@ -1181,7 +1181,7 @@
    margin-inline: var(--tab-inner-inline-margin);
  
    #tabbrowser-tabs[orient="vertical"]:not([expanded]) & > .toolbarbutton-text {
@@ -110,7 +118,7 @@ index 01815c2114a627e5cac183c702bd82f1bd4f58f8..ad3686a4bcac0331d86f5e95ecdb6f02
    }
  
    &:hover {
-@@ -1205,7 +1204,7 @@
+@@ -1205,7 +1205,7 @@
   * flex container. #tabs-newtab-button is a child of the arrowscrollbox where
   * we don't want a gap (between tabs), so we have to add some margin.
   */
@@ -119,7 +127,7 @@ index 01815c2114a627e5cac183c702bd82f1bd4f58f8..ad3686a4bcac0331d86f5e95ecdb6f02
    margin-block: var(--tab-block-margin);
  }
  
-@@ -1229,7 +1228,6 @@
+@@ -1229,7 +1229,6 @@
  }
  
  #vertical-pinned-tabs-container {
@@ -127,7 +135,7 @@ index 01815c2114a627e5cac183c702bd82f1bd4f58f8..ad3686a4bcac0331d86f5e95ecdb6f02
    display: none;
    grid-template-columns: repeat(auto-fit, minmax(var(--tab-pinned-min-width-expanded), auto));
    overflow-y: auto;
-@@ -1439,7 +1437,7 @@
+@@ -1439,7 +1438,7 @@
    toolbarbutton:not(#firefox-view-button),
    toolbarpaletteitem:not(#wrapper-firefox-view-button)
  ) ~ #tabbrowser-tabs {
@@ -136,7 +144,7 @@ index 01815c2114a627e5cac183c702bd82f1bd4f58f8..ad3686a4bcac0331d86f5e95ecdb6f02
    padding-inline-start: calc(var(--tab-overflow-pinned-tabs-width) + 2px);
    margin-inline-start: 2px;
  }
-@@ -1473,7 +1471,6 @@ toolbar:not(#TabsToolbar) #firefox-view-button {
+@@ -1473,7 +1472,6 @@ toolbar:not(#TabsToolbar) #firefox-view-button {
    list-style-image: url(chrome://global/skin/icons/plus.svg);
  }