Added an optional Slow mode setting.
When enabled, download delays, linked-page inspection waits, gallery advancement, quiet periods, and batch pauses are increased by 10×.
Page-scrolling speed and pauses remain unchanged in Slow mode.
Updated countdown messages to accurately show extended wait times.
Added Slow mode status to diagnostic logs.

Release notes — GalleryFetch 1.2.4
- Added automatic 15–30 second pauses after every 50 downloads to improve reliability during large download jobs.
- Added clearer status guidance while GalleryFetch scrolls and scans a page.
- Added a reminder to keep the mouse off the page during scanning, since hovering over page content can reset the stability wait.
- Added the official Firefox extension ID for consistent future updates.