Fixes #24

TikTok draws its own control bar on top of the native one, so the native
controls the add-on enables cannot be clicked.

• Add *://*.tiktok.com/* to exclude_matches in manifest.json.
• Mention TikTok in the README and in both store descriptions (en, pt-BR).
• Bump the version to 6.2.1 so the release workflow publishes the fix.

Lighter and more responsive.

• Pages where the add-on is off no longer use any resources.
• Changes to your site list or mode apply immediately, without reloading.
• Instagram: the audio and tags buttons are no longer covered by the video controls, and the controls work in reels.
• Reduced permissions.

Your site lists and preferences are kept.

A refreshed interface for Firefox desktop and Android.

• New light, dark, and system themes.
• English and Brazilian Portuguese, with a dedicated language selector.
• Improved layout and touch-friendly controls for managing site lists.
• Clearer validation messages and feedback when saving settings fails.
• Convenient links to support the project and leave a review.
• Fixed a desktop popup sizing issue that could display only a scrollbar.

Existing site lists are preserved. Video-control behavior and supported-site restrictions remain unchanged.

feat: auto-fill active domain and enhance validation
- Auto-populate domain input with the current page's hostname when opening the popup
- Enhance domain validation to reject local/private IPs, protected URLs, and extensions
- Show descriptive error message for protected/local domains
- Reject IP addresses (IPv4/IPv6), localhost variants, and private ranges (192.168.x.x, 10.x.x.x, 172.16-31.x.x)
- Improve UX by preventing users from adding invalid domains to lists

Feat: Added option to switch between add-on operation modes:
- Excluded only list - It will work on all supported websites by default. Add domains to this list to block it on them.
- Included only list - Add websites' domains to this list to activate it on them. The add-on will make DOM changes only on those domains added to this list.

Fix: Instagram divs with no class value are clickable again - 'Messages', 'Notifications'...
Fix: Instagram overlays are up a little bit (tags and sound buttons).

Tech stuff:
- Better documentation/comments/code organization.
- Manifest update: No data collection.

Add Instagram support for now.

And no, it doesn't allow you to download videos from it.

Some important notes:
Instagram changes its code faster than most sites, may break my current code kinda easily.
"Tags" button on videos leave a paint trail from the initial position it was placed. I had to move it a bit so it wouldn't overlap with the now active video controls.

Fix - Removes 9gag.com videos overlays -> sound button, video duration.