https://aislackin.com/tags/extension/Recent content in Extension on AiSlackinHugoen-usWed, 12 Aug 2026 00:00:00 +0000https://aislackin.com/posts/2026-08-12-firefoxprintall/Wed, 12 Aug 2026 00:00:00 +0000https://aislackin.com/posts/2026-08-12-firefoxprintall/<p>Firefox&rsquo;s built-in screenshot handles pages whose <em>body</em> scrolls. It falls over completely on modern app layouts — chat UIs, dashboards, playgrounds — where the body never scrolls but a panel inside does. <code>captureTab()</code> hands you the visible viewport and that&rsquo;s it. This extension was built for exactly one such case: an LLM playground whose right-hand response panel scrolls inside a fixed frame.</p> <p>The mechanism is honest scroll-and-stitch: scroll, capture each position, crop each tile to the target region, composite on a canvas. All geometry is computed in device pixels (<code>css px × devicePixelRatio</code>) and tiles are placed by their actual scroll offset, so seams don&rsquo;t appear even with fractional device pixel ratios and a clamped final tile.</p>