Preventing routing slips with tools: the core is the habit of starting your shopping from the point site — the extension notification is the support

The extension's notification is "a button that plants a cookie" — understanding how it works changes how you use it

A point site's official browser extension shows you a banner or popup saying "you can route here" when you open an eligible shopping site. When you click that notification, the extension fires a request through the point site and saves a tracking cookie in your browser — that cookie is what tells the shop's server "this customer came via the point site," which is the basis for your cashback. In other words, the extension's job is to collapse the three-step process of "notification → click the routing link → write the cookie" into a single tap.

Conversely, if you miss the notification and skip it, or if you tap another link after routing and overwrite the cookie, your cashback drops to zero. Understanding the convenience and limits of extensions is the shortest path to eliminating misses. This article covers: how official extensions work, what the major point sites offer, limitations on smartphones, what to watch out for when using multiple sites together, and the risks of fake extensions. For cookie details, see the cookie and routing-tracking mechanics article; for misses in general, see the routing-slip prevention article.

Inside the official extension — what it detects and how it routes you

A point site's official extension uses the browser's extension API to check in real time whether "the URL of the page you just opened is in the offer list." On a match, it shows a notification bar or popup. When you click it, the extension internally fires the routing link and sets the tracking cookie. That cookie has an expiry date (which varies by site and offer — 30 days, 7 days, etc.), and cashback is credited only if you complete your purchase at the shop before the cookie expires.

Even with the extension installed, cookies can't be saved in the browser's private/incognito mode, which can invalidate routing. Also, newly registered shops that haven't been added to the offer database yet won't trigger a notification. The habit of thinking "no notification = no offer?" and then checking the point site's shop search to confirm is important. See the cookie article for more.

Most causes of missed rewards boil down to "actions that overwrite the cookie after you route." Specifically: after routing through the point site and opening the shop, you route through a price-comparison or coupon site or another affiliate link opened in a separate tab and re-enter the same shop, or you accidentally click a link to that shop in an email or on social media—these all cancel out your hard-won point-site routing, because of the principle that the "last link clicked" cookie wins (last-click). The countermeasure is simple: once you route, finish the purchase in one go without detours. If you want a coupon, note the coupon code beforehand—before routing through the point site—and after routing just enter that code on the checkout screen (don't route through an external coupon site afterward). And if you want to compare prices, do it before routing, and route only after deciding which shop to buy from. Keep "route once, just before purchase, and no detours after," and you'll prevent almost all cookie-overwrite accidents. For details on the mechanics, see the cookie and routing-tracking mechanics article.

Official extensions at major point sites — their role and the reality of browser support

Most major Japanese point sites offer an official extension for Chrome. Firefox and Edge support varies by site. The rule is to get extensions from the Chrome Web Store or each site's official page. Any situation where you're told to manually install a file from outside the store is a red flag for a fake extension — avoid it.

• Chrome (PC / Android): The widest coverage. Most point sites have an official Chrome extension. Android Chrome can also run extensions, but may be less stable than the PC version.
• Firefox / Edge (PC): Some point sites offer a compatible extension, but offer count and notification accuracy can be lower than Chrome. Always check the official site for coverage.
• Safari (Mac): Safari extensions (Safari Web Extensions) have a different architecture, and only a limited number of point sites support them. Mac users may want to use Chrome, or consider routing through the iOS official app's in-app browser.
• Notification accuracy gaps: The extension's database (offer list) can lag, so new or limited-time offers may not trigger a notification. Even without a notification, you can route manually from the point site.

Smartphone limits — why iOS and Android can't use extensions, and what to do instead

PC browsers and mobile browsers handle extensions in fundamentally different ways. iOS (iPhone / iPad) Safari's extension support is extremely limited, and point site official extensions are essentially unavailable. Android Chrome's mobile version, unlike the desktop version, doesn't support extensions (as of 2025). This means that on smartphones, the leading method for point activities is not extensions but something else.

For point activities on smartphones, the most reliable approach is to use the "shop routing" feature inside each point site's official app. Routing through the in-app browser sets the cookie correctly, playing the same role as a PC extension. However, if you switch between the in-app browser and an external browser, the cookie may not carry over, so complete your purchase entirely within the in-app browser. For a breakdown of PC vs. smartphone use, see the App vs. PC article.

When using the official app's "shopping routing" on a smartphone, one more thing to watch for is the "jumping from the in-app browser to an external browser" pattern. After opening the shop in the in-app browser, a share button on the product page, an "open in app" button, a social login, or a transition to an external payment service can switch you, before you know it, to a different browser like Safari or Chrome. At that moment, the routing cookie set in the in-app browser may not carry over, and the reward can become invalid. The countermeasure is to complete everything, from routing to purchase, within the in-app browser as much as possible. Even if prompts like "open in browser" or "open in app" appear, during point activity it's safer to proceed right there (in the in-app browser). Those who usually use a shop's own app should switch to entering from the point site's in-app browser just for point-activity shopping, to prevent missed rewards. For using PC versus smartphone, see also the App vs. PC article.

How to use extensions when running multiple point sites simultaneously

Power users sometimes run multiple point sites at once, but having multiple official extensions installed simultaneously can cause overlapping notifications and cookie conflicts. The general rule is that the routing cookie that was "written last" is the one that counts (the last-click principle). This means if you route via Site A and then accidentally click Site B's notification, Site B's cookie overwrites it and Site A's cashback goes to zero.

1. ① Compare shops and offers on PointNaviBefore buying, compare cashback rates across multiple sites on PointNavi and decide which one gives the best deal. Don't try to route through multiple sites at once.
2. ② Pick one site to route through, then click the notificationTemporarily disabling extensions for sites you're not using prevents cookie conflicts.
3. ③ Complete your purchase within that site's browser sessionEven if you open other point sites in other tabs, your cookie won't be overwritten as long as you don't click a link to the target shop from them.
4. ④ Keep a record of which site you used to earn pointsPoints scattered across multiple sites are more likely to expire. See also the point expiry prevention article.

Running multiple extensions simultaneously is technically possible, but carries the risk of notification confusion and cookie conflicts. The simple, safe approach is to decide in advance "which site am I routing through this time?" and only keep that site's extension enabled.

Fake extensions, excessive permissions, and privacy risks — why you must never install non-official extensions

Browser extensions can access powerful browser APIs, and a malicious extension can cause serious harm. Among the risks relevant to point activities, "fake extensions disguised as official point site tools" are particularly dangerous. They can closely mimic the look and name of the real thing, and cases have been reported where, once installed, they scan your browsing history and form inputs (IDs, passwords, credit card numbers).

• Always verify the source: Only install extensions distributed by official sites through the Chrome Web Store. Fakes can appear near the top of search results, so navigate to the Chrome Web Store via a link on the point site's official page.
• Check the permissions: When an extension requests permission to "read and change all your data on the websites you visit," ask whether the stated purpose justifies it. A point site extension needs to read the target shop's URL, but has no reason to read inputs on banking sites or social media.
• Uninstall extensions you no longer use: If you've closed an account with a point site, uninstall its extension. There's a risk it continues collecting data in the background.
• Check reviews and ratings: Be cautious of Chrome Web Store extensions with very few reviews or whose ratings jumped up suddenly.

Official point site extensions are generally safe to use. But the rule is: never use unofficial third-party extensions that claim to "automatically maximize your cashback rate" or "route through all sites at once." For more on safety, see the safety and dangerous-tools article.

The surest way to avoid fake extensions is "don't install from search results—always follow the link from the point site's official page." Searching "(point site name)" in the browser's extension store can put fakes with names and icons just like the real one at the top. Since you can't tell the real one from the name or icon alone, it's safer to first log in legitimately to the point site via the official app or browser, and follow the distribution link from the site's "extension" guide page to install. On the store page, check three things: ① whether the developer (provider) name matches that point site's operating company; ② whether the review count/rating isn't extremely low, or unnaturally all-high; and ③ whether the requested permissions go beyond "reading the target shop's URL" and try to read your input on banking sites, email, or social media. If anything is even slightly suspicious, don't install it. And be sure to uninstall extensions of point sites you no longer use, to prevent background data collection. For details on safety, see the safety and dangerous-tools article.

The fundamentals when not relying on extensions — building the ability to route even without a notification

Extension notifications are, ultimately, a "tool to help you notice." For offers where no notification fires — recently added offers, limited-time offers, or offers where the extension database is behind — you can still route even without a single notification appearing. Whether you can do this "notification-free routing" is a big factor in how many points you miss over time.

• When you "want to buy," search the shop name on PointNavi first: Regardless of whether a notification fires, routing from the shop page on the point site will correctly set your cookie.
• Add your point sites to your bookmark bar: It's less work than searching each time — bookmark the sites you use most so you can open them right away.
• Make the pre-purchase "routing check" a routine: After adding items to your cart and before hitting the checkout button, the one-second habit of confirming "did I just route?" prevents misses.
• Know what to do when points don't post: If your cashback ends up at zero, some sites allow you to submit an inquiry to claim it. See the what to do when points don't post article.

Mini glossary — browser extension × point-activity terms

Getting comfortable with cookie and routing vocabulary lets you avoid misses without relying on notifications alone. Cookie expiry and extension support vary by site and offer — always check each point site's official page for the latest information.

Cookie expiry and extension support vary by site and offer. Check each point site's official page for the latest. For mechanics, see the cookie and routing-tracking mechanics article; for routing misses, see routing-slip prevention; for safety, see safety and dangerous-tools; for when points don't post, see what to do when points don't post.

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