Does it still happen in [[Diagnose Firefox issues using Troubleshoot Mode|Troubleshoot Mode]]?

yub, it still happening in troubleshoot mode. One additional note, this issue is happening on Firefox that was installed on arch Linux only

Is <b>layout.css.font-variations.enabled</b> set to ''true'' on the <b>about:config</b> page ? *https://support.mozilla.org/en-US/kb/about-config-editor-firefox What font is used ? You can right-click and select "Inspect" to open the built-in Inspector with this element selected. *https://firefox-source-docs.mozilla.org/devtools-user/page_inspector/how_to/open_the_inspector/ *https://firefox-source-docs.mozilla.org/devtools-user/page_inspector/how_to/examine_and_edit_html/ You can check in the <b>Rules</b> tab in the right panel in the Inspector what font-family is used for selected text. You can check in the <b>Fonts</b> tab in the right panel in the Inspector what font is actually used because Firefox might be using a different font than specified by the website. If the Fonts tab is hidden, click the down arrow at the right end. *https://firefox-source-docs.mozilla.org/devtools-user/page_inspector/how_to/edit_fonts/

I have used inspect fonts to detrmine the font that was causing the issue. It was freemono freeseirf thanks a lot