- new `string-template` and `renderStringPref` (regex pattern matching) in chromium extension options
- new `cssInvertPage`, `cssInvertThumb`, and `cssInvertFilter` settings (with defaults; off by default)
- available filters: `brightness()`, `contrast()`, `grayscale()`, `invert()`, `sepia()`, `saturate()`, and `hue-rotate()` via regex (valid CSS syntax)
- translations for `en-US`, `en-GB`, `en-CA`, and `de`
- filter influences PDF view container and PDF thmbnail container (thus also custom text/drawings/highlights)
- new svg as icon (modified `toolbarButton-editorStamp.svg`)
- button toggle is added next to zoom/scale controls in the middle of the toolbar
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