a few tips to improve battery life and speed of browser, especially chrome-based browsers:
- put cache into ramdrive (512Mb should be enough) -> less disk usage + faster page loading = better battery life
- install h264ify for chrome and firefox-based browsers -> significantly reduces CPU usage on youtube videos (VP9 -> h264, which supports hardware acceleration)
- try to find the extensions which cause battery drain: create a bookmark folder contains ~20 different pages -> open chrome built-in task manager or in firefox about
erformance -> right click and open all pages from the bookmark folder at the same time -> look at the task manager and see which extension uses the most CPU
- use a good adblocker like ublock origin with some recommended filterlists
- the extension: animation policy -> may help
- the great suspender may help if you use a lot of tabs
- use some about:flags tweaks (Override software rendering list, Fast tab/window close, GPU rasterization, Simple Cache for HTTP, Number of raster threads -> 4, Enable PPAPI Win32k Lockdown, Enable AppContainer Lockdown,...)
- disable useless plugins: Native Client, Widevine Content Decryption Module, and maybe flash if you don't use