A suspend feature, like the low power mode, is good idea.
To edit text on page, I think that the web developer menu is many browsers would be suitable for such a purpose, and a separate menu for that seems unnecessary to me.
Allow copy/paste is good, although I would do it a bit differently. Similarly like many spreadsheet programs have the option for manual or auto calculation, to do that for web pages also; if set to manual calculation mode then nothing is calculated or sent to the server until you push send or recalculate, and most events are suppressed, so it cannot prevent you to copy/paste, nor can it spy on data that you have entered but chosen to not send yet. It would also improve speed and less power, and avoid problems with some forms that will put in a number automatically if you erase the number and make it difficult to enter the correct number due to that. So, it would solve ten problems at once.
"Open Page in Internet Archive" may be useful, but seems to me should be an extension rather than a built-in feature (although it could be an extension which is included by default).
However, some things that would be good to have in a web browser would be: User controlled request/response headers (this can make many other settings unnecessary, e.g. language, as well as anything that can be controlled by the Content-Security-Policy header, etc). Add user styles and user scripts (without needing to package an extension). Be able to use native code extensions (which must be installed manually and cannot be installed from the web service). Relative location bar mode. ARIA mode.
Zero telemetry is good.
A suspend feature, like the low power mode, is good idea.
To edit text on page, I think that the web developer menu is many browsers would be suitable for such a purpose, and a separate menu for that seems unnecessary to me.
Allow copy/paste is good, although I would do it a bit differently. Similarly like many spreadsheet programs have the option for manual or auto calculation, to do that for web pages also; if set to manual calculation mode then nothing is calculated or sent to the server until you push send or recalculate, and most events are suppressed, so it cannot prevent you to copy/paste, nor can it spy on data that you have entered but chosen to not send yet. It would also improve speed and less power, and avoid problems with some forms that will put in a number automatically if you erase the number and make it difficult to enter the correct number due to that. So, it would solve ten problems at once.
"Open Page in Internet Archive" may be useful, but seems to me should be an extension rather than a built-in feature (although it could be an extension which is included by default).
However, some things that would be good to have in a web browser would be: User controlled request/response headers (this can make many other settings unnecessary, e.g. language, as well as anything that can be controlled by the Content-Security-Policy header, etc). Add user styles and user scripts (without needing to package an extension). Be able to use native code extensions (which must be installed manually and cannot be installed from the web service). Relative location bar mode. ARIA mode.