Implementing features from Mercury

[ThousandDemonDaggers]

Since it seems that Mercury adds many patches that Floorp hasn't implemented yet, wouldn't be a good idea to implement them in Floorp? Also, Mercury doesn't seem to be updated regularly anymore. (Some discussion partially related to this was already talked here).

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List of patches included in Mercury

• Compiler modifications include AVX, AES, LTO and PGO.
• Disable all telemetry and reporting.
• Remove all debugging constructs and enable hardening by default.
• Enable backspace to go back, and GPU acceleration by default.
• Enable Do Not Track and Global Privacy Control.
• Disable Pocket, highlights, and suggested content on the new tab page.
• Restore top bar to ~ESR78 state with home button and developer button.
• Allow installing unsigned extensions.
• Branding changes
• Enable JPEG XL by default
• Implemented performance tweaks from BetterFox.

– Some help in creating these patches came from LibreWolf, Waterfox, FireDragon, PlasmaFox, Ghostery, and GNU IceCat.

– Any other code/patches are written from scratch by Alex313031.

Patch URLs to use when rebasing.

https://gitlab.com/librewolf-community/browser/source/-/blob/main/patches/ui-patches/firefox-view.patch

https://gitlab.com/librewolf-community/browser/source/-/blob/main/patches/allow-JXL-in-non-nightly-browser.patch

https://gitlab.com/librewolf-community/browser/source/-/blob/main/patches/windows-theming-bug.patch

https://gitlab.com/librewolf-community/browser/source/-/tree/main/patches

https://github.com/ghostery/user-agent-desktop/blob/main/patches/0018-Ghostery-Theme.patch

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Source: https://github.com/Alex313031/Mercury/blob/main/docs/PATCHES.md