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Button of Text Highlighting is missing in PDF mode

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Firefox ver. 125.0.2. The newly deployed Text Highlighting function is not working properly. Button of Text Highlighting is missing in PDF mode.

Firefox ver. 125.0.2. The newly deployed Text Highlighting function is not working properly. Button of Text Highlighting is missing in PDF mode.
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It is a limited rollout. Go to about:studies in the address bar and remove the study "Highlighting in PDFs - Rollout", then change pdfjs.enableHighlightEditor to true in about:config. Reload any open PDFs to see the changes.