Stackブラウザ not working: what to check, in order

The expensive way to fix a browser is to search each symptom separately and try whatever the first result suggests. Settings get changed, the app gets reinstalled, more settings get changed, and after an hour nobody can say what the original state was. The cheap way starts one step earlier, by deciding which of three places the problem lives in before touching anything. Most of what looks broken in a closed beta browser turns out to be either a feature that has not shipped yet or a plan limit with no error message attached, and both are identifiable in minutes once the sorting is done.

Sort the symptom before changing a setting

Every symptom belongs to one of three buckets.

The first is local configuration: operating system permissions, which profile a window belongs to, and the ceiling of the current plan. The second is the state of the build itself: the version installed, and whether the capability being looked for exists in it at all. The third is the other end: the site being opened, the network in between, or the account being signed into.

Mixing the three is what makes troubleshooting feel endless, because a change in one bucket cannot be evaluated while another bucket is still suspect. Silent notifications illustrate this well. The cause might be a permission that was never granted to the new application, a feature that behaves differently than expected, or a per-service setting on the site itself. Three different owners, three different fixes, and only one of them is reachable from the app's own settings screen.

One habit makes the whole sequence safer: record the current state before changing it. Note the version installed, which windows were open when the symptom appeared, and whether it happens on every account or only one. Two lines in a text file is enough. Without that record, a reinstall erases the evidence along with the problem, and if the symptom returns a week later the investigation starts from zero again. It also prevents the most common false conclusion in troubleshooting, which is crediting a fix to the last thing changed when several things were changed at once.

Sort first, then work from the checks that cost seconds toward the ones that cost hours. The order below does that, and each step can be stopped as soon as it explains what is happening. There is no need to reach step seven if step two accounts for the symptom.

It will not start, or it stops at the first screen

Before assuming a fault, confirm the entitlement. The pricing FAQ describes the product as being in a closed beta, not publicly available, with access granted to users of the earlier version, people on the waitlist, and buyers of a lifetime license. An invitation code is entered on the start screen to activate the app, and a lifetime buyer is told to sign in with the email address used at purchase or by connecting the associated wallet.

If the app stops at a screen asking for a code, nothing inside the application will move it forward. That is an access question, not a configuration one, and it is answered by whoever issued the code.

A separate class of start failure belongs to the operating system rather than the app. On macOS, the first launch of an application obtained outside the App Store can require a different confirmation step than later launches, and a laptop managed by an employer may block installation entirely. Confirming whether other recently downloaded applications open normally separates the two cases quickly, and the current rules for that first launch are documented by Apple Support.

One more check belongs here: the account, not the app, may be the blocker. Trying the same sign-in in the default browser on the same machine shows in under a minute whether the credentials themselves are working.

The build in hand may be the only build there is

The next question is what version is actually installed, because a surprising number of troubleshooting hours go into hunting for an update that does not exist.

The filenames on the download page carry the version, and as of September 2026 the published build is 4.9.13 with a beta suffix, offered for macOS on Intel, macOS on Apple Silicon, and Windows on 64-bit. The publication date can be read directly from the server. Asking for headers on the download URL returns a last-modified value of 10 October 2024 for both the macOS and the Windows installer.

That single fact reframes several symptoms. If something behaves oddly and the installed version matches the published one, then reinstalling will reproduce the same behavior, and waiting for a patch is a different kind of decision than applying one. Effort is better spent on a workaround, or on evaluating whether the capability exists at all, than on update hunting.

It also changes how to read older advice. Instructions written against a build from a different year may refer to menus that were renamed or removed. Checking the version first makes it obvious which instructions are worth following.

Two things that are missing by design

Two of the most common complaints are not faults. Both are documented.

Extensions come first. The pricing FAQ states that Chrome extensions are not currently supported, while the marketing page carries a section about extensions, so the site itself gives two impressions. Searching the settings for an extensions panel is therefore not a productive use of time. The practical response is to move each job that an extension was doing somewhere else: password entry to a standalone manager or the system keychain, blocking to a network or system level tool, translation to a separate window rather than an in-page button.

Import comes second.

It's not possible to migrate data from other browsers in Stack yet. Source: stackbrowser.com

The same answer notes that history, bookmarks, active sessions, and passwords are being added gradually. So bookmarks that do not appear were never copied, and no setting will summon them. Exporting bookmarks from the previous browser to an HTML file and rebuilding the daily set by hand is faster than searching for an import button, especially where services can be added by name from a catalogue rather than by pasting URLs, as the list on Supported apps illustrates.

Everything feels heavy

Slowness is the easiest symptom to diagnose, because the mechanism is published.

Stack runs on the Chromium engine. Each web card has the same memory and CPU usage as it would in a Chrome tab. Source: stackbrowser.com

The same entry describes a suspension mechanism that puts an unused card to sleep to reduce consumption. Read together, these say that memory pressure scales with how many cards are awake, which makes the test obvious: close half of what is open and see whether behavior changes. If it does, the count is the cause. If it does not, look elsewhere.

When the count is the cause, three responses work. Use the suspension mechanism on anything not needed right now. Split the set into things that stay open all day and things opened on demand. Give heavy pages such as video calls and dashboards a window of their own, so that closing them is a single action.

Sluggishness and stuttering are different problems, though, and conflating them wastes time. Typing lag and jerky scrolling often come from rendering rather than memory, and a useful discriminator is when the symptom appears: degradation that builds through the afternoon points at memory, while stuttering that is present from the first minute, or that starts when an external display is connected, points at rendering. Keeping a one-line note for three days, recording what was open and which action felt slow, usually settles it.

Notifications and sign-ins

Notifications have three possible owners, and they should be checked in this order: the operating system permission for this specific application, the app's own settings, then the service's own notification preferences. Permissions on macOS are granted per application and are not inherited from a previously used browser, and a focus mode can suppress delivery even where permission exists. Checking the app's internal settings before the system permission is the classic way to conclude that a fix worked when nothing changed.

Too many notifications is usually the opposite problem: the same service signed in under several accounts delivers one alert per account. That is expected behavior, and the question becomes whether alerts can be muted per account rather than per service.

Repeated sign-outs have a single common cause. Where two windows look separate but share one cookie store, signing in again on one silently invalidates the other. This is how Chromium based products behave, and the test takes a minute: sign in to account A in one window and account B in another, then reload both. If the first one dropped, the windows share a jar. That is a design decision rather than a fault, but it is decisive for anyone who needs two accounts of the same service live at once, and the mechanism is described on Workspaces.

If a specific site refuses the sign-in while the default browser accepts it on the same machine, the block is at the service end, not in local configuration.

Some limits are the plan, not a fault

The quietest category of false alarm is the plan ceiling, because hitting one often produces no message at all. The pricing page lists the free Starter tier with unlimited profiles, 5 Flows, and 3 color themes. The PRO tier at 15 dollars monthly or 144 dollars annually removes the Flow limit and offers 11 themes.

So an attempt to create a sixth Flow that appears to do nothing is not necessarily a bug, and color options that will not apply are not necessarily a rendering problem. Counting what already exists answers the question in seconds and prevents a pointless reinstall. It is worth carrying this habit into any comparison as well, since free tier ceilings are where similar looking products differ most; a side by side breakdown such as Compared with Shift shows how different those ceilings can be between tools in the same category.

One related point on where data lives: the FAQ states that the application operates locally and does not store information in its own database. Local storage means recovery is a local task, and it also means a second machine will not inherit the setup on its own.

What to change first

Run the seven checks in order once, then split every remaining symptom into two piles: things that local changes can fix, such as permissions, open card counts, account separation, and plan ceilings, and things that are absent from the build, such as extensions and import. Stop spending time on the second pile, because no setting reaches it. For a shortlist of alternatives, start from tools that publish their separation model and their free ceiling plainly, the way SpaceDeck does, and verify both during the first week rather than the third.