Issue #25751 | webcompat.com

Browser / Version: Firefox 67.0
Operating System: Windows 10
Tested Another Browser: Yes
Problem type: Design is broken
Description: The web font '__Zilla Slab SemiBold_5' is not used
Steps to Reproduce:
Loaded the website and saw that it was using the default font instead of the downloaded web font for most if not all text (headings and body text). Firefox 65 on Arch Linux used the web font, as did Vivaldi 2.3.1440.41 on Windows 10.
Browser Configuration
mixed active content blocked: false
image.mem.shared: true
buildID: 20190209181359
tracking content blocked: false
gfx.webrender.blob-images: true
hasTouchScreen: false
mixed passive content blocked: false
gfx.webrender.enabled: false
gfx.webrender.all: false
channel: nightly
Console Messages:
[u'[JavaScript Error: "downloadable font: Layout: DFLT script doesn\'t satisfy the spec. DefaultLangSys is NULL (font-family: "__Zilla Slab SemiBold_5" style:normal weight:600 stretch:100 src index:1) source: http://www.uscoproject.fi/fonts/zilla-slab-v1-latin-600.woff" {file: "unknown" line: 1 column: 953 source: "@font-face {\n  font-family: "__Zilla Slab SemiBold_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-600.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-600.svg") format("svg");\n  font-style: normal;\n  font-weight: 600;\n}"}]', u'[JavaScript Error: "downloadable font: Layout: Failed to parse script table 0 (font-family: "__Zilla Slab SemiBold_5" style:normal weight:600 stretch:100 src index:1) source: http://www.uscoproject.fi/fonts/zilla-slab-v1-latin-600.woff" {file: "unknown" line: 1 column: 953 source: "@font-face {\n  font-family: "__Zilla Slab SemiBold_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-600.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-600.svg") format("svg");\n  font-style: normal;\n  font-weight: 600;\n}"}]', u'[JavaScript Error: "downloadable font: GSUB: Failed to parse script list table (font-family: "__Zilla Slab SemiBold_5" style:normal weight:600 stretch:100 src index:1) source: http://www.uscoproject.fi/fonts/zilla-slab-v1-latin-600.woff" {file: "unknown" line: 1 column: 953 source: "@font-face {\n  font-family: "__Zilla Slab SemiBold_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-600.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-600.svg") format("svg");\n  font-style: normal;\n  font-weight: 600;\n}"}]', u'[JavaScript Error: "downloadable font: GSUB: Failed to parse table (font-family: "__Zilla Slab SemiBold_5" style:normal weight:600 stretch:100 src index:1) source: http://www.uscoproject.fi/fonts/zilla-slab-v1-latin-600.woff" {file: "unknown" line: 1 column: 953 source: "@font-face {\n  font-family: "__Zilla Slab SemiBold_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-600.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-600.svg") format("svg");\n  font-style: normal;\n  font-weight: 600;\n}"}]', u'[JavaScript Error: "downloadable font: rejected by sanitizer (font-family: "__Zilla Slab SemiBold_5" style:normal weight:600 stretch:100 src index:1) source: http://www.uscoproject.fi/fonts/zilla-slab-v1-latin-600.woff" {file: "unknown" line: 1 column: 953 source: "@font-face {\n  font-family: "__Zilla Slab SemiBold_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-600.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-600.svg") format("svg");\n  font-style: normal;\n  font-weight: 600;\n}"}]', u'[JavaScript Warning: "downloadable font: no supported format found (font-family: "__Zilla Slab SemiBold_5" style:normal weight:600 stretch:100 src index:3) source: (end of source list)" {file: "unknown" line: 1 column: 953 source: "@font-face {\n  font-family: "__Zilla Slab SemiBold_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-600.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-600.svg") format("svg");\n  font-style: normal;\n  font-weight: 600;\n}"}]', u'[JavaScript Error: "downloadable font: Layout: DFLT script doesn\'t satisfy the spec. DefaultLangSys is NULL (font-family: "__Zilla Slab Medium_5" style:normal weight:500 stretch:100 src index:1) source: http://www.uscoproject.fi/fonts/zilla-slab-v1-latin-500.woff" {file: "unknown" line: 1 column: 135 source: "@font-face {\n  font-family: "__Zilla Slab Medium_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-500.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-500.svg") format("svg");\n  font-style: normal;\n  font-weight: 500;\n}"}]', u'[JavaScript Error: "downloadable font: Layout: Failed to parse script table 0 (font-family: "__Zilla Slab Medium_5" style:normal weight:500 stretch:100 src index:1) source: http://www.uscoproject.fi/fonts/zilla-slab-v1-latin-500.woff" {file: "unknown" line: 1 column: 135 source: "@font-face {\n  font-family: "__Zilla Slab Medium_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-500.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-500.svg") format("svg");\n  font-style: normal;\n  font-weight: 500;\n}"}]', u'[JavaScript Error: "downloadable font: GSUB: Failed to parse script list table (font-family: "__Zilla Slab Medium_5" style:normal weight:500 stretch:100 src index:1) source: http://www.uscoproject.fi/fonts/zilla-slab-v1-latin-500.woff" {file: "unknown" line: 1 column: 135 source: "@font-face {\n  font-family: "__Zilla Slab Medium_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-500.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-500.svg") format("svg");\n  font-style: normal;\n  font-weight: 500;\n}"}]', u'[JavaScript Error: "downloadable font: GSUB: Failed to parse table (font-family: "__Zilla Slab Medium_5" style:normal weight:500 stretch:100 src index:1) source: http://www.uscoproject.fi/fonts/zilla-slab-v1-latin-500.woff" {file: "unknown" line: 1 column: 135 source: "@font-face {\n  font-family: "__Zilla Slab Medium_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-500.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-500.svg") format("svg");\n  font-style: normal;\n  font-weight: 500;\n}"}]', u'[JavaScript Error: "downloadable font: rejected by sanitizer (font-family: "__Zilla Slab Medium_5" style:normal weight:500 stretch:100 src index:1) source: http://www.uscoproject.fi/fonts/zilla-slab-v1-latin-500.woff" {file: "unknown" line: 1 column: 135 source: "@font-face {\n  font-family: "__Zilla Slab Medium_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-500.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-500.svg") format("svg");\n  font-style: normal;\n  font-weight: 500;\n}"}]', u'[JavaScript Warning: "downloadable font: no supported format found (font-family: "__Zilla Slab Medium_5" style:normal weight:500 stretch:100 src index:3) source: (end of source list)" {file: "unknown" line: 1 column: 135 source: "@font-face {\n  font-family: "__Zilla Slab Medium_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-500.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-500.svg") format("svg");\n  font-style: normal;\n  font-weight: 500;\n}"}]', u'[JavaScript Error: "downloadable font: Layout: DFLT script doesn\'t satisfy the spec. DefaultLangSys is NULL (font-family: "__Zilla Slab_5" style:normal weight:400 stretch:100 src index:1) source: http://www.uscoproject.fi/fonts/zilla-slab-v1-latin-regular.woff" {file: "unknown" line: 1 column: 683 source: "@font-face {\n  font-family: "__Zilla Slab_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-regular.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-regular.svg") format("svg");\n  font-style: normal;\n  font-weight: 400;\n}"}]', u'[JavaScript Error: "downloadable font: Layout: Failed to parse script table 0 (font-family: "__Zilla Slab_5" style:normal weight:400 stretch:100 src index:1) source: http://www.uscoproject.fi/fonts/zilla-slab-v1-latin-regular.woff" {file: "unknown" line: 1 column: 683 source: "@font-face {\n  font-family: "__Zilla Slab_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-regular.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-regular.svg") format("svg");\n  font-style: normal;\n  font-weight: 400;\n}"}]', u'[JavaScript Error: "downloadable font: GSUB: Failed to parse script list table (font-family: "__Zilla Slab_5" style:normal weight:400 stretch:100 src index:1) source: http://www.uscoproject.fi/fonts/zilla-slab-v1-latin-regular.woff" {file: "unknown" line: 1 column: 683 source: "@font-face {\n  font-family: "__Zilla Slab_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-regular.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-regular.svg") format("svg");\n  font-style: normal;\n  font-weight: 400;\n}"}]', u'[JavaScript Error: "downloadable font: GSUB: Failed to parse table (font-family: "__Zilla Slab_5" style:normal weight:400 stretch:100 src index:1) source: http://www.uscoproject.fi/fonts/zilla-slab-v1-latin-regular.woff" {file: "unknown" line: 1 column: 683 source: "@font-face {\n  font-family: "__Zilla Slab_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-regular.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-regular.svg") format("svg");\n  font-style: normal;\n  font-weight: 400;\n}"}]', u'[JavaScript Error: "downloadable font: rejected by sanitizer (font-family: "__Zilla Slab_5" style:normal weight:400 stretch:100 src index:1) source: http://www.uscoproject.fi/fonts/zilla-slab-v1-latin-regular.woff" {file: "unknown" line: 1 column: 683 source: "@font-face {\n  font-family: "__Zilla Slab_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-regular.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-regular.svg") format("svg");\n  font-style: normal;\n  font-weight: 400;\n}"}]', u'[JavaScript Warning: "downloadable font: no supported format found (font-family: "__Zilla Slab_5" style:normal weight:400 stretch:100 src index:3) source: (end of source list)" {file: "unknown" line: 1 column: 683 source: "@font-face {\n  font-family: "__Zilla Slab_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-regular.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-regular.svg") format("svg");\n  font-style: normal;\n  font-weight: 400;\n}"}]', u'[JavaScript Error: "downloadable font: Layout: DFLT script doesn\'t satisfy the spec. DefaultLangSys is NULL (font-family: "__Zilla Slab Medium_5" style:italic weight:500 stretch:100 src index:1) source: http://www.uscoproject.fi/fonts/zilla-slab-v1-latin-500italic.woff" {file: "unknown" line: 1 column: 400 source: "@font-face {\n  font-family: "__Zilla Slab Medium_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-500italic.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-500italic.svg") format("svg");\n  font-style: italic;\n  font-weight: 500;\n}"}]', u'[JavaScript Error: "downloadable font: Layout: Failed to parse script table 0 (font-family: "__Zilla Slab Medium_5" style:italic weight:500 stretch:100 src index:1) source: http://www.uscoproject.fi/fonts/zilla-slab-v1-latin-500italic.woff" {file: "unknown" line: 1 column: 400 source: "@font-face {\n  font-family: "__Zilla Slab Medium_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-500italic.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-500italic.svg") format("svg");\n  font-style: italic;\n  font-weight: 500;\n}"}]', u'[JavaScript Error: "downloadable font: GSUB: Failed to parse script list table (font-family: "__Zilla Slab Medium_5" style:italic weight:500 stretch:100 src index:1) source: http://www.uscoproject.fi/fonts/zilla-slab-v1-latin-500italic.woff" {file: "unknown" line: 1 column: 400 source: "@font-face {\n  font-family: "__Zilla Slab Medium_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-500italic.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-500italic.svg") format("svg");\n  font-style: italic;\n  font-weight: 500;\n}"}]', u'[JavaScript Error: "downloadable font: GSUB: Failed to parse table (font-family: "__Zilla Slab Medium_5" style:italic weight:500 stretch:100 src index:1) source: http://www.uscoproject.fi/fonts/zilla-slab-v1-latin-500italic.woff" {file: "unknown" line: 1 column: 400 source: "@font-face {\n  font-family: "__Zilla Slab Medium_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-500italic.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-500italic.svg") format("svg");\n  font-style: italic;\n  font-weight: 500;\n}"}]', u'[JavaScript Error: "downloadable font: rejected by sanitizer (font-family: "__Zilla Slab Medium_5" style:italic weight:500 stretch:100 src index:1) source: http://www.uscoproject.fi/fonts/zilla-slab-v1-latin-500italic.woff" {file: "unknown" line: 1 column: 400 source: "@font-face {\n  font-family: "__Zilla Slab Medium_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-500italic.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-500italic.svg") format("svg");\n  font-style: italic;\n  font-weight: 500;\n}"}]', u'[JavaScript Warning: "downloadable font: no supported format found (font-family: "__Zilla Slab Medium_5" style:italic weight:500 stretch:100 src index:3) source: (end of source list)" {file: "unknown" line: 1 column: 400 source: "@font-face {\n  font-family: "__Zilla Slab Medium_5";\n  src: local(""), url("../fonts/zilla-slab-v1-latin-500italic.woff") format("woff"), url("../fonts/zilla-slab-v1-latin-500italic.svg") format("svg");\n  font-style: italic;\n  font-weight: 500;\n}"}]']
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