Some of vimium's functions are not available because of security policies

Describe the bug Blocked script execution in some page because the document's frame is sandboxed and the 'allow-scripts' permission is not set.

To Reproduce

Go to URL 'https://raw.githubusercontent.com/philc/vimium/master/README.md'
typed 'T' no responese

Console error

Blocked script execution in 'chrome-extension://dbepggeogbaibhgnhhndojpepiihcmeb/pages/help_dialog.html' because the document's frame is sandboxed and the 'allow-scripts' permission is not set. README

Browser and Vimium version

Vimium version:1.66

Google Chrome	83.0.4103.116 (正式版本) （64 位） (cohort: Stable)
修订版本	8f0c18b4dca9b6699eb629be0f51810c24fb6428-refs/branch-heads/4103@{#716}
操作系统	Windows 10 OS Version 2004 (Build 19041.329)
JavaScript	V8 8.3.110.13
Flash	32.0.0.387 C:\Users\wlei3\AppData\Local\Google\Chrome\User Data\PepperFlash\32.0.0.387\pepflashplayer.dll
用户代理	Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36
命令行	"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" --disable-features=TabHoverCards --enable-audio-service-sandbox --enable-features=ParallelDownloading --flag-switches-begin --enable-quic --flag-switches-end --enable-audio-service-sandbox
可执行文件路径	C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
个人资料路径	C:\Users\wlei3\AppData\Local\Google\Chrome\User Data\Default
其他变体	af81735d-ca7d8d80dff70c3e-ca7d8d80317c6f31-377be55a

philc / vimium

Some of vimium's functions are not available because of security policies #3617