i've tried different pdfs. They all seem to behave same. It's as if there are 2 copies, one overlayed over the other. I tried to copy and paste, but didn't work. could take a snapshot if necessary. thanks
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If you have increased the minimum font size then try the default setting "none" as a high value can cause issues like you described.
- Tools > Options > Content : Fonts & Colors > Advanced > Minimum Font Size (none)
- Tools > Options > Content : Fonts & Colors > Advanced > [X] "Allow pages to choose their own fonts, instead of my selections above"
Try to disable hardware acceleration in Firefox.
- Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
Instead of Tools > Options use:
- Mac: Firefox > Preferences
- Linux: Edit > Preferences
- Windows: Firefox > Options