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Home/ Questions/Q 7771199
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Editorial Team
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Editorial Team
Asked: June 1, 20262026-06-01T16:35:29+00:00 2026-06-01T16:35:29+00:00

The option.js file of Email this page (Chrome extension example) contains the following code:

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The option.js file of “Email this page“ (Chrome extension example) contains the following code:

if (window.localStorage == null) {
  ...
if (window.localStorage.customMailtoUrl == null) {

What does this mean? What is window.localStorage?

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  1. Editorial Team
    Editorial Team
    2026-06-01T16:35:30+00:00Added an answer on June 1, 2026 at 4:35 pm

    localStorage/sessionStorage is part of HTML5 API. Essentially, this is what cookies are used for. But this is a lot better.

    https://developer.mozilla.org/en/DOM/Storage

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